ci: bump some actions versions

So that Github will complain no more about running on outdated
Node.js runtime.

.github/workflows/ci.yml

@@ -53,7 +53,7 @@ jobs:
     env:
       SHELL: /bin/sh            # needed for erlexec
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - uses: erlef/setup-beam@v1
         with:
@@ -70,7 +70,7 @@ jobs:
         run: PATH=$PATH:/usr/lib/postgresql/${{matrix.pg}}/bin/ make test
 
       - name: Upload CT logs artifact
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         if: failure()
         with:
           name: ct_report_pg-${{matrix.pg}}_otp-${{matrix.otp}}