ci: bump astral-sh/setup-uv from 6 to 7

Bumps [astral-sh/setup-uv](https://github.com/astral-sh/setup-uv) from 6 to 7.
- [Release notes](https://github.com/astral-sh/setup-uv/releases)
- [Commits](astral-sh/setup-uv@v6...v7)

---
updated-dependencies:
- dependency-name: astral-sh/setup-uv
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/build-flutter-app.yml

@@ -110,7 +110,7 @@ jobs:
       # runner image happens to ship, so this gate behaves the same here as it
       # does locally (`uv run --python 3.12 scripts/ci/check-release-version.py`).
       - name: Set up uv
-        uses: astral-sh/setup-uv@v6
+        uses: astral-sh/setup-uv@v7
         with:
           python-version: '3.12'
 

.github/workflows/ci.yml

@@ -26,7 +26,7 @@ jobs:
       # which Android then refuses on install. uv pins the interpreter so this
       # behaves the same locally and on the runner.
       - name: Set up uv
-        uses: astral-sh/setup-uv@v6
+        uses: astral-sh/setup-uv@v7
         with:
           python-version: '3.12'
       - name: Test the release versionCode gate