ci: update github actions to v3

Update checkout and upload-artifact action to v3 to mute nodejs
deprecation warning.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
(cherry picked from commit 52570d4242822e3db678f5484c2ca3e72f485d52)

.github/workflows/formal.yml

@@ -11,7 +11,7 @@ jobs:
       fail-fast: false
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           ref: ${{ github.event.pull_request.head.sha }}
           fetch-depth: 0

.github/workflows/multi-arch-test-build.yml

@@ -48,7 +48,7 @@ jobs:
             runtime_test: true
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           fetch-depth: 0
 
@@ -92,13 +92,13 @@ jobs:
         run: cp bin/packages/${{ matrix.arch }}/packages_ci/*.ipk . || true
 
       - name: Store packages
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: ${{ matrix.arch}}-packages
           path: "*.ipk"
 
       - name: Store logs
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: ${{ matrix.arch}}-logs
           path: logs/