Remove DBMS_LOCK grant from shared setup; keep it only for 11g

DBMS_SESSION.SLEEP is available in Oracle 12c+ and does not require
a separate DBMS_LOCK grant. Move the grant into the test_11g workflow
where it is still needed.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: yahonda

.github/workflows/test_11g.yml

@@ -84,6 +84,9 @@ jobs:
     - name: Create database user
       run: |
         ./ci/setup_accounts.sh
+    - name: Grant execute on DBMS_LOCK for Oracle 11g
+      run: |
+        echo "GRANT EXECUTE ON DBMS_LOCK TO hr;" | sqlplus system/${DATABASE_SYS_PASSWORD}@${DATABASE_NAME}
     - name: Disable ActiveRecord for TruffleRuby
       run: |
         echo "NO_ACTIVERECORD=true" >> $GITHUB_ENV

spec/support/unlock_and_setup_hr_user.sql

@@ -1,4 +1,3 @@
 create user hr identified by hr;
 alter user hr identified by hr account unlock;
 grant dba to hr;
-grant execute on dbms_lock to hr;