Bump jre 17 -> 21

Author: ntwigg

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        jre: [17]
+        jre: [21]
         os: [ubuntu-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:

gradle.properties

@@ -7,7 +7,7 @@ git_url=github.com/diffplug/webtools
 plugin_tags=node
 plugin_list=node jte
 
-ver_java=17
+ver_java=21
 
 javadoc_links=