Activate Mircometer Observation CI test (#443)

Author: marcingrzejszczak

.github/workflows/plugins-jdk17-test.0.yaml

@@ -59,8 +59,7 @@ jobs:
       matrix:
         case:
           - jdk17-with-gson-scenario
-#          TODO: We can't test it just yet, because it requires a Skywalking release
-#          - resttemplate-6.x-scenario
+          - resttemplate-6.x-scenario
     steps:
       - uses: actions/checkout@v2
         with:

test/plugin/scenarios/resttemplate-6.x-scenario/pom.xml

@@ -39,7 +39,7 @@
         (if you build from command line, just use ./mvnw -Dsw.version=x.y.z),
         but make sure not to check it into the code base / git
         -->
-        <sw.version>
+        <sw.version>8.14.0
         </sw.version>
     </properties>