Bump mariadb-java-client from 3.0.7 to 3.0.8 (#2621)

Bumps [mariadb-java-client](https://github.com/mariadb-corporation/mariadb-connector-j) from 3.0.7 to 3.0.8.
- [Release notes](https://github.com/mariadb-corporation/mariadb-connector-j/releases)
- [Changelog](https://github.com/mariadb-corporation/mariadb-connector-j/blob/master/CHANGELOG.md)
- [Commits](mariadb-corporation/mariadb-connector-j@3.0.7...3.0.8)

---
updated-dependencies:
- dependency-name: org.mariadb.jdbc:mariadb-java-client
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

pom.xml

@@ -685,7 +685,7 @@
         <dependency>
             <groupId>org.mariadb.jdbc</groupId>
             <artifactId>mariadb-java-client</artifactId>
-            <version>3.0.7</version>
+            <version>3.0.8</version>
             <optional>true</optional>
         </dependency>