Bump discord4j-core from 3.0.11 to 3.0.12

Bumps [discord4j-core](https://github.com/Discord4J/Discord4J) from 3.0.11 to 3.0.12.
- [Release notes](https://github.com/Discord4J/Discord4J/releases)
- [Commits](Discord4J/Discord4J@3.0.11...3.0.12)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

pom.xml

@@ -92,7 +92,7 @@
         <dependency>
             <groupId>com.discord4j</groupId>
             <artifactId>discord4j-core</artifactId>
-            <version>3.0.11</version>
+            <version>3.0.12</version>
         </dependency>
         <dependency>
             <groupId>com.rometools</groupId>