Update actions/cache action to v4

Author: renovate[bot]

.github/workflows/erlang-thrift-build.yml

@@ -21,7 +21,7 @@ jobs:
           rebar3-version: '3.18'
 
       - name: Restore PLT cache
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         id: plt-cache
         with:
           key: |