fix: upgrade MySQL Connector to fix CVE-2023-22102 (GreenButtonAlliance#35)

- Replace deprecated mysql:mysql-connector-java with com.mysql:mysql-connector-j
- Upgrade from 8.0.32 (vulnerable) to 9.1.0 (secure)
- Fixes CVE-2023-22102: MySQL Connectors takeover vulnerability
- Aligns with datacustodian and thirdparty modules using 9.1.0
- All tests pass with new connector version

Resolves Dependabot alert GreenButtonAlliance#8
GHSA-m6vm-37g8-gqvh

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Sonnet 4.5 <[email protected]>

Author: dfcoffin

openespi-common/pom.xml

@@ -409,9 +409,9 @@
 
 <!--        add dependency for mysql-->
         <dependency>
-            <groupId>mysql</groupId>
-            <artifactId>mysql-connector-java</artifactId>
-            <version>8.0.32</version>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+            <version>9.1.0</version>
             <scope>test</scope>
         </dependency>