Bump flask from 1.1.2 to 2.0.0 in /examples

[dependabot]

Bumps flask from 1.1.2 to 2.0.0.

Release notes

Sourced from flask's releases.

2.0.0

New major versions of all the core Pallets libraries, including Flask 2.0, have been released! 🎉

• Read the announcement on our blog: https://palletsprojects.com/blog/flask-2-0-released/
• Read the full list of changes: https://flask.palletsprojects.com/changes/#version-2-0-0
• Retweet the announcement on Twitter: https://twitter.com/PalletsTeam/status/1392266507296514048
• Follow our blog, Twitter, or GitHub to see future announcements.

This represents a significant amount of work, and there are quite a few changes. Be sure to carefully read the changelog, and use tools such as pip-compile and Dependabot to pin your dependencies and control your updates.

2.0.0rc2

• Changes: https://flask.palletsprojects.com/en/master/changes#version-2-0-0

2.0.0rc1

• Changes: https://flask.palletsprojects.com/en/master/changes/#version-2-0-0

Changelog

Sourced from flask's changelog.

Version 2.0.0

Released 2021-05-11

• Drop support for Python 2 and 3.5.
• Bump minimum versions of other Pallets projects: Werkzeug >= 2, Jinja2 >= 3, MarkupSafe >= 2, ItsDangerous >= 2, Click >= 8. Be sure to check the change logs for each project. For better compatibility with other applications (e.g. Celery) that still require Click 7, there is no hard dependency on Click 8 yet, but using Click 7 will trigger a DeprecationWarning and Flask 2.1 will depend on Click 8.
• JSON support no longer uses simplejson. To use another JSON module, override app.json_encoder and json_decoder. :issue:3555
• The encoding option to JSON functions is deprecated. :pr:3562
• Passing script_info to app factory functions is deprecated. This was not portable outside the flask command. Use click.get_current_context().obj if it's needed. :issue:3552
• The CLI shows better error messages when the app failed to load when looking up commands. :issue:2741
• Add :meth:sessions.SessionInterface.get_cookie_name to allow setting the session cookie name dynamically. :pr:3369
• Add :meth:Config.from_file to load config using arbitrary file loaders, such as toml.load or json.load. :meth:Config.from_json is deprecated in favor of this. :pr:3398
• The flask run command will only defer errors on reload. Errors present during the initial call will cause the server to exit with the traceback immediately. :issue:3431
• :func:send_file raises a :exc:ValueError when passed an :mod:io object in text mode. Previously, it would respond with 200 OK and an empty file. :issue:3358
• When using ad-hoc certificates, check for the cryptography library instead of PyOpenSSL. :pr:3492
• When specifying a factory function with FLASK_APP, keyword argument can be passed. :issue:3553
• When loading a .env or .flaskenv file, the current working directory is no longer changed to the location of the file. :pr:3560
• When returning a (response, headers) tuple from a view, the headers replace rather than extend existing headers on the response. For example, this allows setting the Content-Type for jsonify(). Use response.headers.extend() if extending is desired. :issue:3628
• The Scaffold class provides a common API for the Flask and Blueprint classes. Blueprint information is stored in attributes just like Flask, rather than opaque lambda functions. This is intended to improve consistency and maintainability. :issue:3215
• Include samesite and secure options when removing the session cookie. :pr:3726

... (truncated)

Commits

• 2f0c62f Merge pull request #4007 from pallets/release-2.0.0
• f8e63d3 release version 2.0.0
• 1403d35 update type annotations
• 3a5532b update pallets projects minimum versions
• f8f0caf update requirements
• 9c1e7f6 Merge pull request #4005 from pallets/pre-commit-ci-schedule
• 8b72f6a update pre-commit monthly
• 28262c3 Merge pull request #3999 from greyli/improve-cli-docs
• 531671c Improve the wording of using FLASK_APP
• 2c88e8a Merge pull request #4003 from pallets/autodoc-typehints
• Additional commits viewable in compare view

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[codecov]

Codecov Report

Merging #5821 (ad268aa) into master (b889708) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5821      +/-   ##
==========================================
- Coverage   71.03%   70.99%   -0.04%     
==========================================
  Files         440      440              
  Lines       16562    16562              
==========================================
- Hits        11764    11759       -5     
- Misses       3935     3937       +2     
- Partials      863      866       +3     

Impacted Files	Coverage Δ
pkg/skaffold/util/tar.go	50.66% <0.00%> (-5.34%)	⬇️
pkg/skaffold/docker/image.go	78.34% <0.00%> (-1.39%)	⬇️
pkg/skaffold/docker/parse.go	87.14% <0.00%> (+0.95%)	⬆️

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