build(deps): bump actions/cache from 5.0.5 to 6.0.0

Bumps [actions/cache](https://github.com/actions/cache) from 5.0.5 to 6.0.0.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@27d5ce7...2c8a9bd)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

action.yml

@@ -191,7 +191,7 @@ runs:
         echo "SETUP_OPT=${setup_opt}" >> $GITHUB_ENV
 
     - name: Cache Python packages
-      uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
+      uses: actions/cache@2c8a9bd7457de244a408f35966fab2fb45fda9c8 # v6.0.0
       with:
         path: ${{ env.PIP_CACHE_PATH }}
         key: pip-${{ runner.os }}-${{ hashFiles(format('{0}/zephyr/scripts/requirements*.txt', inputs.base-path)) }}
@@ -216,7 +216,7 @@ runs:
 
     - name: Cache Zephyr SDK
       id: cache-toolchain
-      uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
+      uses: actions/cache@2c8a9bd7457de244a408f35966fab2fb45fda9c8 # v6.0.0
       with:
         path: ${{ inputs.base-path }}/zephyr-sdk
         key: ${{ env.SDK_CACHE_KEY }}
@@ -257,7 +257,7 @@ runs:
 
     - name: Cache ccache data
       if: inputs.enable-ccache == 'true' && runner.os != 'Windows'
-      uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
+      uses: actions/cache@2c8a9bd7457de244a408f35966fab2fb45fda9c8 # v6.0.0
       with:
         path: ${{ env.CCACHE_DIR }}
         key: ccache-${{ inputs.ccache-cache-key }}-${{ env.CCACHE_TIMESTAMP }}