fix: bump actions/cache from 3 to 4 (#25)

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](https://github.com/actions/cache/compare/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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Matt Trachier <matttrach@gmail.com>

.github/workflows/release.yaml

@@ -40,7 +40,7 @@ jobs:
         if: steps.release-please.outputs.pr
       - run: sudo chmod 0755 /nix/store
         if: steps.release-please.outputs.pr
-      - uses: actions/cache/restore@v3
+      - uses: actions/cache/restore@v4
         id: cache-nix-restore
         if: steps.release-please.outputs.pr
         with:
@@ -66,7 +66,7 @@ jobs:
             --keep AWS_SESSION_TOKEN \
             --keep TERM \
             ${{ github.workspace }}
-      - uses: actions/cache/save@v3
+      - uses: actions/cache/save@v4
         id: cache-nix-save
         if: steps.release-please.outputs.pr
         with:
@@ -78,7 +78,7 @@ jobs:
           role-to-assume: ${{env.AWS_ROLE}}
           role-session-name: ${{github.job}}-${{github.run_id}}-${{github.run_number}}-${{github.run_attempt}}
           aws-region: ${{env.AWS_REGION}}
-      - uses: actions/cache/restore@v3
+      - uses: actions/cache/restore@v4
         id: cache-terraform-restore
         if: steps.release-please.outputs.pr
         with:
@@ -86,7 +86,7 @@ jobs:
           key: terraform-${{hashFiles('**/versions.tf','**/main.tf')}}
       - run: terraform init -upgrade
         if: steps.release-please.outputs.pr
-      - uses: actions/cache/save@v3
+      - uses: actions/cache/save@v4
         id: cache-terraform-save
         if: steps.release-please.outputs.pr
         with:

.github/workflows/tests.yaml

@@ -29,13 +29,13 @@ jobs:
           --keep AWS_SESSION_TOKEN \
           --keep TERM \
           ${{ github.workspace }}
-    - uses: actions/cache/restore@v3
+    - uses: actions/cache/restore@v4
       id: cache-terraform-restore
       with:
         path: ${{ github.workspace }}/.terraform
         key: terraform
     - run: terraform init -upgrade
-    - uses: actions/cache/save@v3
+    - uses: actions/cache/save@v4
       id: cache-terraform-save
       with:
         path: ${{ github.workspace }}/.terraform