Enable building against Java 23-ea

This commit updates the CI workflow to build against Java 23-ea as
well, using the temurin distribution. For consistency, we're also
building against Java 22.

Closes gh-32090

Author: snicoll

.github/workflows/ci.yml

@@ -20,6 +20,11 @@ jobs:
             toolchain: false
           - version: 21
             toolchain: true
+          - version: 22
+            toolchain: true
+          - version: 23-ea
+            distribution: temurin
+            toolchain: true
         exclude:
           - os:
               name: Linux