build(deps): bump actions/cache from 4 to 5 (#222)

Author: dependabot[bot]

.github/workflows/docs.yml

@@ -26,7 +26,7 @@ jobs:
         run: echo "::set-output name=dir::$(pip cache dir)"
 
       - name: Cache dependencies
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: ${{ steps.pip-cache.outputs.dir }}
           key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements-docs.txt') }}