Update actions/cache action to v4.2.1

Author: renovate[bot]

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
           version-type: strict
 
       - name: Restore the deps and _build cache
-        uses: actions/cache@1bd1e32a3bdc45362d1e726936510720a7c30a57 # v4.2.0
+        uses: actions/cache@0c907a75c2c80ebcb7f088228285e798b750cf8f # v4.2.1
         id: restore-cache
         env:
           OTP_VERSION: ${{ steps.beam.outputs.otp-version }}