ci: upgrade downstream check to include GraalVM 22.2.0 (#1789)

Author: mpeddada1

.github/workflows/downstream-native-image.yaml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        graalvm: [22.1.0, 22.0.0.2, 21.3.2]
+        graalvm: [22.2.0, 22.1.0]
         java: [11, 17]
         repo:
         # GAPIC library that doesn't use a real GCP project in integration tests
@@ -38,4 +38,4 @@ jobs:
     - run: java -version
     - run: sudo apt-get update -y
     - run: sudo apt-get install libxml2-utils
-    - run: .kokoro/downstream-client-library-check.sh ${{matrix.repo}} graalvm
+    - run: .kokoro/downstream-client-library-check.sh ${{matrix.repo}} graalvm