Using Eclipse temurin

as AdoptOpenJDK is getting deprecated.

Eclipse ``temurin`` is a defacto renamed AdoptOpenJDK.

Ref:
* https://blog.adoptopenjdk.net/2021/08/goodbye-adoptopenjdk-hello-adoptium/
* https://github.com/actions/setup-java#supported-distributions

.github/workflows/ci.yml

@@ -37,7 +37,7 @@ jobs:
         uses: actions/setup-java@v2
         with:
           java-version: 8
-          distribution: "adopt"
+          distribution: "temurin"
 
       - name: Cache Gradle dependencies
         uses: actions/cache@v2
@@ -69,7 +69,7 @@ jobs:
         uses: actions/setup-java@v2
         with:
           java-version: 8
-          distribution: "adopt"
+          distribution: "temurin"
 
       - name: Cache Gradle dependencies
         uses: actions/cache@v2
@@ -97,7 +97,7 @@ jobs:
 #         uses: actions/setup-java@v2
 #         with:
 #           java-version: 11 # Sonar requires JDK 11
-#           distribution: "adopt"
+#           distribution: "temurin"
 
 #       - name: Cache SonarCloud packages
 #         uses: actions/cache@v2