Update action versions used in CI workflows

The "smoke test" sketch compilation and reporting actions have been moved to dedicated repositories. The actions hosted
at the old `arduino/actions/libraries/*` location will no longer be maintained.

Since the time the actions were migrated to the dedicated repositories, a breaking change was made to the default value
of the `sketches-report-path` input, which required a change to the values of the `name` and `path` inputs of the
	`actions/upload-artifact` action.

Author: per1234

.github/workflows/compile-examples.yml

@@ -25,6 +25,7 @@ jobs:
     env:
       # sketch paths to compile (recursive) compatible with all boards
       UNIVERSAL_SKETCH_PATHS: '"libraries/Scheduler"'
+      SKETCHES_REPORTS_PATH: sketches-reports
 
     strategy:
       fail-fast: false
@@ -62,7 +63,7 @@ jobs:
         run: mv "$GITHUB_WORKSPACE/ArduinoCore-API/api" "$GITHUB_WORKSPACE/cores/arduino"   
 
       - name: Compile examples
-        uses: arduino/actions/libraries/compile-examples@master
+        uses: arduino/compile-sketches@main
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           fqbn: ${{ matrix.board.fqbn }}
@@ -78,7 +79,7 @@ jobs:
 
       - name: Save memory usage change report as artifact
         if: github.event_name == 'pull_request'
-        uses: actions/upload-artifact@v1
+        uses: actions/upload-artifact@v2
         with:
-          name: size-deltas-reports
-          path: size-deltas-reports
+          path: ${{ env.SKETCHES_REPORTS_PATH }}
+          name: ${{ env.SKETCHES_REPORTS_PATH }}

.github/workflows/report-size-deltas.yml

@@ -8,4 +8,4 @@ jobs:
 
     steps:
       - name: Comment size deltas reports to PRs
-        uses: arduino/actions/libraries/report-size-deltas@master
+        uses: arduino/report-size-deltas@main