build(deps): bump astral-sh/setup-uv from 3 to 7

Bumps [astral-sh/setup-uv](https://github.com/astral-sh/setup-uv) from 3 to 7.
- [Release notes](https://github.com/astral-sh/setup-uv/releases)
- [Commits](astral-sh/setup-uv@v3...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/ci.yml

@@ -15,7 +15,7 @@ jobs:
         working-directory: backend
     steps:
       - uses: actions/checkout@v4
-      - uses: astral-sh/setup-uv@v3
+      - uses: astral-sh/setup-uv@v7
       - uses: actions/setup-python@v5
         with:
           python-version: "3.12"