ci: simplify UV dependency caching in backend workflows

- Replaced `actions/cache` with native caching options in `setup-uv` for both `test-backend.yml` and `lint-backend.yml`.
- Updated caching configuration to use `enable-cache` and `cache-dependency-glob` settings for improved clarity and maintainability.

Author: Pdzly

.github/workflows/lint-backend.yml

@@ -32,13 +32,8 @@ jobs:
         uses: astral-sh/setup-uv@v5
         with:
           version: "0.9.18"
-
-      - name: Cache uv dependencies
-        uses: actions/cache@v4
-        with:
-          path: ~/.cache/uv
-          key: uv-${{ runner.os }}-${{ hashFiles('backend/uv.lock') }}
-          restore-keys: uv-${{ runner.os }}-
+          enable-cache: true
+          cache-dependency-glob: "backend/uv.lock"
 
       - name: Install dependencies
         run: uv sync

.github/workflows/test-backend.yml

@@ -42,13 +42,8 @@ jobs:
         uses: astral-sh/setup-uv@v5
         with:
           version: "0.9.18"
-
-      - name: Cache uv dependencies
-        uses: actions/cache@v4
-        with:
-          path: ~/.cache/uv
-          key: uv-${{ runner.os }}-${{ hashFiles('backend/uv.lock') }}
-          restore-keys: uv-${{ runner.os }}-
+          enable-cache: true
+          cache-dependency-glob: "backend/uv.lock"
 
       - name: Install dependencies
         run: uv sync --extra test --extra migrations --extra metrics