Update to latest cache action

Author: SzymonPobiega

.github/workflows/validate-pull-requests.yml

@@ -22,7 +22,7 @@ jobs:
            curl --connect-timeout 5 --max-time 15 --silent --show-error https://s3.amazonaws.com/particular.downloads/Particular.DocsTool/version.json >> docstool-version.json
       - name: Cache docstool
         id: cache-docstool
-        uses: actions/cache@v4.0.2
+        uses: actions/cache@v4.2.2
         with:
           path: |
              ~/.dotnet/tools/docstool