Update actions/cache to latest version (#118)

This change cherry-picks the fix by Marco that updates the cache hash
for the actions provided by Github.

Author: weirdwater

.github/workflows/TestPWTCommands.yml

@@ -34,7 +34,7 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: "Defining cache"
-        uses: actions/cache@937d24475381cd9c75ae6db12cb4e79714b926ed # v2
+        uses: actions/cache@d4323d4df104b026a6aa633fdb11d772146be0bf # v4
         env:
           cache-name: cache-node-modules
         with:

.github/workflows/UnitTests.yml

@@ -29,7 +29,7 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: "Defining cache"
-        uses: actions/cache@937d24475381cd9c75ae6db12cb4e79714b926ed # v2
+        uses: actions/cache@d4323d4df104b026a6aa633fdb11d772146be0bf # v4
         env:
           cache-name: cache-node-modules
         with: