build(deps): 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] <[email protected]>

.github/workflows/build.yml

@@ -61,7 +61,7 @@ jobs:
           SPK_TO_BUILD: ${{ github.event.inputs.package }}
 
       - name: Cache downloaded files
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: distrib
           # use run_id in key to cache within workflow only.
@@ -90,13 +90,13 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Cache toolchains
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: toolchain/*/work
           key: toolchain-${{ matrix.arch }}-v3-${{ hashFiles('toolchain/*/digests') }}
 
       - name: Use cache of downloaded files
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: distrib
           key: distrib-${{ github.run_id }}