ci(actions): bump actions/cache from 4 to 5

Bumps [actions/cache](https://github.com/actions/cache) from 4 to 5.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v4...v5)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '5'
  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

@@ -24,7 +24,7 @@ jobs:
           node-version: "24"
       - uses: pnpm/action-setup@v4
       - run: pnpm install --frozen-lockfile
-      - uses: actions/cache@v4
+      - uses: actions/cache@v5
         with:
           path: .turbo
           key: turbo-quality-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml') }}-${{ github.sha }}
@@ -44,7 +44,7 @@ jobs:
           node-version: "24"
       - uses: pnpm/action-setup@v4
       - run: pnpm install --frozen-lockfile
-      - uses: actions/cache@v4
+      - uses: actions/cache@v5
         with:
           path: .turbo
           key: turbo-docs-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml') }}-${{ github.sha }}
@@ -87,7 +87,7 @@ jobs:
           # Do NOT set registry-url — it creates an .npmrc that overrides OIDC
       - uses: pnpm/action-setup@v4
       - run: pnpm install --frozen-lockfile
-      - uses: actions/cache@v4
+      - uses: actions/cache@v5
         with:
           path: .turbo
           key: turbo-release-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml') }}-${{ github.sha }}