Bump ch.qos.logback:logback-classic from 1.2.9 to 1.3.12

Bumps [ch.qos.logback:logback-classic](https://github.com/qos-ch/logback) from 1.2.9 to 1.3.12.
- [Commits](qos-ch/logback@v_1.2.9...v_1.3.12)

---
updated-dependencies:
- dependency-name: ch.qos.logback:logback-classic
  dependency-type: direct:production
...

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

pom.xml

@@ -35,7 +35,7 @@
         <maven.compiler.testRelease>11</maven.compiler.testRelease>
         <maven.compiler.testSource>11</maven.compiler.testSource>
         <maven.compiler.testTarget>11</maven.compiler.testTarget>
-        <logback-classic.version>1.2.9</logback-classic.version>
+        <logback-classic.version>1.3.12</logback-classic.version>
     </properties>
 
     <groupId>org.hl7.fhir.publisher</groupId>