chore(deps): update actions/cache action to v5

Author: renovate[bot]

.github/workflows/ci.yml

@@ -26,7 +26,7 @@ jobs:
         with:
           python-version: "3.14"
 
-      - uses: actions/cache@v4
+      - uses: actions/cache@v5
         with:
           path: ~/.cache/pipenv
           key: ${{ runner.os }}-pipenv-${{ hashFiles('**/Pipfile.lock') }}
@@ -53,7 +53,7 @@ jobs:
         id: pip-cache
         run: echo "PIP_CACHE_DIR=$(pip cache dir)" | tee -a "${GITHUB_OUTPUT}"
 
-      - uses: actions/cache@v4
+      - uses: actions/cache@v5
         with:
           path: ${{ steps.pip-cache.outputs.PIP_CACHE_DIR }}
           key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}

.github/workflows/gh-pages.yml

@@ -26,7 +26,7 @@ jobs:
         id: pip-cache
         run: echo "PIP_CACHE_DIR=$(pip cache dir)" | tee -a "${GITHUB_OUTPUT}"
 
-      - uses: actions/cache@v4
+      - uses: actions/cache@v5
         with:
           path: ${{ steps.pip-cache.outputs.PIP_CACHE_DIR }}
           key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}