bump to jdk17

Signed-off-by: Andre Dietisheim <[email protected]>

build.gradle

@@ -1,19 +1,6 @@
 buildscript {
     ext.ideaVersion = ideaVersion
-    /*
-     * for more complex conversion ideaVersion -> sinceIdeaBuild
-     * see https://github.com/rhdunn/xquery-intellij-plugin/blob/master/build.gradle#L1-L47
-     */
-    def since = ideaVersion =~ /IC-20(\d\d)\.([1-3])(\.\d+)?$/
-    if (since.matches()) {
-        ext.sinceIdeaBuild = "${since.group(1)}${since.group(2)}".toInteger()
-    }
-
-    if (ext.sinceIdeaBuild >= 223) {
-        ext.java_version = "17"
-    } else {
-        ext.java_version = "11"
-    }
+    ext.java_version = "17"
 }
 
 plugins {