Bump actions/cache from 2 to 3

Bumps [actions/cache](https://github.com/actions/cache) from 2 to 3.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](https://github.com/actions/cache/compare/v2...v3)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/production.yml

@@ -24,7 +24,7 @@ jobs:
       with:
         node-version: '14'
     - name: Cache Jekyll build
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: |
           .jekyll-cache

.github/workflows/tests.yml

@@ -19,7 +19,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Cache node modules
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: ~/.npm
         key: ${{ runner.os }}-npm-${{ hashFiles('**/package-lock.json') }}
@@ -50,7 +50,7 @@ jobs:
       with:
         node-version: '14'
     - name: Cache Jekyll build
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: |
           .jekyll-cache
@@ -115,7 +115,7 @@ jobs:
       - run: tar xvf site.tar
       - name: Cache HTMLProofer
         id: cache-htmlproofer
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: tmp/.htmlproofer
           key: ${{ runner.os }}-htmlproofer-${{ hashFiles('_site/**.html') }}