Bump slf4j.version from 2.0.5 to 2.0.6

Bumps `slf4j.version` from 2.0.5 to 2.0.6.

Updates `slf4j-api` from 2.0.5 to 2.0.6
- [Release notes](https://github.com/qos-ch/slf4j/releases)
- [Commits](qos-ch/slf4j@v_2.0.5...v_2.0.6)

Updates `slf4j-simple` from 2.0.5 to 2.0.6
- [Release notes](https://github.com/qos-ch/slf4j/releases)
- [Commits](qos-ch/slf4j@v_2.0.5...v_2.0.6)

---
updated-dependencies:
- dependency-name: org.slf4j:slf4j-api
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.slf4j:slf4j-simple
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

pom.xml

@@ -24,7 +24,7 @@
     <os72.protobuf-shaded.plugin-version>${protobuf.version}</os72.protobuf-shaded.plugin-version>
     <os72.protobuf-shaded.version>3-11-1</os72.protobuf-shaded.version>
     <protobuf.version>3.11.1</protobuf.version>
-    <slf4j.version>2.0.5</slf4j.version>
+    <slf4j.version>2.0.6</slf4j.version>
   </properties>
 
   <url>http://www.signalfx.com</url>