reverted to Java 17 in CI workflow

Signed-off-by: Konstantin Läufer <laufer@cs.luc.edu>

Author: klaeufer

.github/workflows/main_primechecker.yml

@@ -16,7 +16,7 @@ permissions:
 env:
   AZURE_FUNCTIONAPP_NAME: primechecker # set this to your function app name on Azure
   PACKAGE_DIRECTORY: '.' # set this to the directory which contains pom.xml file
-  JAVA_VERSION: '21' # set this to the java version to use
+  JAVA_VERSION: '17' # set this to the java version to use
 
 jobs:
   build-and-deploy:

pom.xml

@@ -11,7 +11,7 @@
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <java.version>21</java.version>
+    <java.version>17</java.version>
     <maven.version>3.6.3</maven.version>
     <azure.functions.maven.plugin.version>1.39.0</azure.functions.maven.plugin.version>
     <azure.functions.java.library.version>3.2.1</azure.functions.java.library.version>