Bump logback-core from 1.3.0-alpha11 to 1.3.0-alpha12

Bumps [logback-core](https://github.com/qos-ch/logback) from 1.3.0-alpha11 to 1.3.0-alpha12.
- [Release notes](https://github.com/qos-ch/logback/releases)
- [Commits](qos-ch/logback@v_1.3.0-alpha11...v_1.3.0-alpha12)

---
updated-dependencies:
- dependency-name: ch.qos.logback:logback-core
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

pom.xml

@@ -97,7 +97,7 @@
     <kerb-simplekdc.version>2.0.1</kerb-simplekdc.version>
     <log4j.version>1.2.17</log4j.version>
     <log4j2.version>2.17.0</log4j2.version>
-    <logback.version>1.3.0-alpha11</logback.version>
+    <logback.version>1.3.0-alpha12</logback.version>
     <mariadb.version>2.7.4</mariadb.version>
     <mariadb.docker.version>10.3.6</mariadb.docker.version>
     <maven.version>3.8.4</maven.version>