Bump stalwartlabs/mail-server from v0.6.0 to v0.7.0

Bumps stalwartlabs/mail-server from v0.6.0 to v0.7.0.

---
updated-dependencies:
- dependency-name: stalwartlabs/mail-server
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Dockerfile

@@ -1,5 +1,5 @@
 # From https://github.com/stalwartlabs/mail-server/blob/main/Dockerfile
-FROM stalwartlabs/mail-server:v0.6.0
+FROM stalwartlabs/mail-server:v0.7.0
 
 COPY --chmod=775 start.sh /start.sh