Bump slf4jVersion from 2.0.13 to 2.0.15

Bumps `slf4jVersion` from 2.0.13 to 2.0.15.

Updates `org.slf4j:slf4j-api` from 2.0.13 to 2.0.15

Updates `org.slf4j:slf4j-simple` from 2.0.13 to 2.0.15

Updates `org.slf4j:jcl-over-slf4j` from 2.0.13 to 2.0.15

---
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:production
  update-type: version-update:semver-patch
- dependency-name: org.slf4j:jcl-over-slf4j
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

pom.xml

@@ -101,7 +101,7 @@
     <checkstyle.violation.ignore>None</checkstyle.violation.ignore>
     <sisuVersion>0.9.0.M3</sisuVersion>
     <guiceVersion>6.0.0</guiceVersion>
-    <slf4jVersion>2.0.13</slf4jVersion>
+    <slf4jVersion>2.0.15</slf4jVersion>
     <!-- Used by Jetty Transport (client) and Test HTTP (server) -->
     <jettyVersion>10.0.22</jettyVersion>
     <!-- used by supplier and demo only -->