chore: Add changelog for 0.12.2 (#4579)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: max-sixty

CHANGELOG.md

@@ -1,22 +1,11 @@
 # PRQL Changelog
 
-## [unreleased]
+## 0.12.2 — 2024-06-10
 
-**Language**:
-
-**Features**:
-
-**Fixes**:
-
-**Documentation**:
+0.12.2 is a very small release which renames `prql-js` to `prqlc-js` to match
+our standard naming scheme. Within node the package is imported as `prqlc`.
 
-**Web**:
-
-**Integrations**:
-
-**Internal changes**:
-
-**New Contributors**:
+It also fixes a mistake in the `prqlc-python` release pipeline.
 
 ## 0.12.1 — 2024-06-09