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](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>

.github/workflows/ci.yml

@@ -41,7 +41,7 @@ jobs:
       # Mac's can't run this action, so we're forced to do this.
       - name: Create Github cache from Buildkite artifacts
         id: cache-buildkite-artifacts
-        uses: actions/cache/save@v3
+        uses: actions/cache/save@v4
         with:
           path: artifacts
           key: buildkite-artifacts-${{ github.sha }}
@@ -54,7 +54,7 @@ jobs:
       - uses: actions/checkout@v3
       - name: Restore Github cache of Buildkite artifacts
         id: cache-buildkite-artifacts
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
         with:
           path: artifacts
           key: buildkite-artifacts-${{ github.sha }}
@@ -158,7 +158,7 @@ jobs:
       - uses: actions/checkout@v3
       - name: Restore Github cache of Buildkite artifacts
         id: cache-buildkite-artifacts
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
         with:
           path: artifacts
           key: buildkite-artifacts-${{ github.sha }}
@@ -268,7 +268,7 @@ jobs:
       - uses: actions/checkout@v3
       - name: Restore Github cache of Buildkite artifacts
         id: cache-buildkite-artifacts
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
         with:
           path: artifacts
           key: buildkite-artifacts-${{ github.sha }}