Drop Java 8 support

Author: guusdk

.github/workflows/build.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [ "8", "11" ]
+        java: [ "11" ]
 
     steps:
       # Checkout Repo

plugin.xml

@@ -8,7 +8,6 @@
     <version>${project.version}</version>
     <date>2024-08-23</date>
     <minServerVersion>4.8.0</minServerVersion>
-    <minJavaVersion>1.8</minJavaVersion>
     <databaseKey>monitoring</databaseKey>
     <databaseVersion>8</databaseVersion>