Make the minimum Java version 8

Author: wikumChamith

.github/workflows/maven.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       matrix:
         platform: [ ubuntu-latest ]
-        java-version: [ 21 ]
+        java-version: [ 8, 11, 21 ]
 
     runs-on: ${{ matrix.platform }}
     env:

pom.xml

@@ -47,7 +47,7 @@
 	<properties>
 		<openmrsPlatformVersion>2.7.3</openmrsPlatformVersion>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <javaCompilerVersion>21</javaCompilerVersion>
+        <javaCompilerVersion>8</javaCompilerVersion>
 	</properties>
 
 	<dependencyManagement>