Update Gradle source and target compatibility to 1.8

Author: teetangh

.github/workflows/tests.yaml

@@ -38,7 +38,7 @@ jobs:
 
       - name: Run Gradle Tests
         id: run
-        run: ./gradlew --no-daemon test
+        run: ./gradlew test --stacktrace 
 
       - name: Report Status
         if: always()

build.gradle

@@ -6,8 +6,8 @@ plugins {
 
 group = 'org.couchbase.quickstart.springdata'
 version = '0.0.1-SNAPSHOT'
-sourceCompatibility = '11'
-targetCompatibility = '11'
+sourceCompatibility = '1.8'
+targetCompatibility = '1.8'
 archivesBaseName = 'java-springdata-quickstart'
 
 repositories {