Bump actions/cache from 3 to 4

Bumps [actions/cache](https://github.com/actions/cache) from 3 to 4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v3...v4)

---
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/_tests.yml

@@ -35,7 +35,7 @@ jobs:
           java-version: 17
 
       - name: Cache plenv
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         env:
           cache-name: cache-plenv
           cache-version: 0
@@ -85,7 +85,7 @@ jobs:
           java-version: 17
 
       - name: Cache asdf
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.asdf
           key: asdf-${{ runner.os }}
@@ -130,7 +130,7 @@ jobs:
           java-version: 17
 
       - name: Cache perlbrew
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: |
             ~/perl5
@@ -178,7 +178,7 @@ jobs:
           java-version: 17
 
       - name: Cache perlbrew
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: |
             ~/perl5