Upgrading to nb-javac from JDK 27b23

[lahodaj]

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[mbien]

suggestion:

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 20f9322..b94eb02 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1470,10 +1470,10 @@
     timeout-minutes: 60
     strategy:
       matrix:
-        java: [ '21', '26' ]
+        java: [ '21', '27-ea' ]
         config: [ 'batch1', 'batch2' ]
         exclude:
-          - java: ${{ github.event_name == 'pull_request' && 'nothing' || '26' }}
+          - java: ${{ github.event_name == 'pull_request' && 'nothing' || '27-ea' }}
       fail-fast: false
     steps:

the hints job was skipped in #9402 since it had to wait for the nb-javac update