update to Java 21 including github workflows

Author: dschwartz-ftadvisory

.github/workflows/build-and-test-main.yml

@@ -21,10 +21,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: Set up JDK 17
+    - name: Set up JDK 21
       uses: actions/setup-java@v4
       with:
-        java-version: '17'
+        java-version: '21'
         distribution: 'temurin'
         cache: maven
     - name: Set up Python 3.11

.github/workflows/create-tagged-release.yml

@@ -20,7 +20,7 @@ jobs:
       uses: actions/setup-java@v4
       with:
         distribution: 'temurin'
-        java-version: '17'  # Matches the enforced version in the POM
+        java-version: '21'  # Matches the enforced version in the POM
         cache: maven
 
     - name: Cache Maven dependencies