Update mandrel version from 21 to 25 in simple-build-test.yml (#2069)

Signed-off-by: Eric Deandrea <edeandrea@redhat.com>

Author: edeandrea

.github/workflows/simple-build-test.yml

@@ -190,7 +190,7 @@ jobs:
       fail-fast: true
       matrix:
         java:
-          - { jvm: '21', mandrel: '21' }
+          - { jvm: '21', mandrel: '25' }
         project:
           - { name: event-statistics }
           - { name: rest-fights }
@@ -235,7 +235,7 @@ jobs:
       fail-fast: true
       matrix:
         java:
-          - { jvm: '21', mandrel: '21' }
+          - { jvm: '21', mandrel: '25' }
         project:
           - { name: rest-heroes }
           - { name: rest-villains }
@@ -282,7 +282,7 @@ jobs:
       fail-fast: true
       matrix:
         java:
-          - { jvm: '21', mandrel: '21' }
+          - { jvm: '21', mandrel: '25' }
         project:
           - event-statistics
           - rest-fights