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] <support@github.com>

.github/workflows/build.yml

@@ -9,13 +9,13 @@ jobs:
       matrix:
         board: [alturia_v1_2, rpi_pico]
     steps:
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         id: zepyhr_workspace_cache
         with:
           path: ~/zephyrproject/
           key: zephyr_workspace_cache_v1
 
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         id: zepyhr_sdk_cache
         with:
           path: ~/zephyr-sdk-0.16.8