chore(deps): update actions/cache action to v6

Author: renovate[bot]

.github/workflows/lint.yml

@@ -17,7 +17,7 @@ jobs:
       - uses: astral-sh/setup-uv@v8.1.0
         with:
           enable-cache: true
-      - uses: actions/cache@v5
+      - uses: actions/cache@v6
         with:
           path: ~/.cache/pre-commit
           key: pre-commit-${{ hashFiles('.pre-commit-config.yaml') }}