Bump slf4j.version from 2.0.13 to 2.0.15

Bumps `slf4j.version` 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

---
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] <[email protected]>

pom.xml

@@ -26,7 +26,7 @@
         <java.version>11</java.version>
         <prometheus.version>1.13.2</prometheus.version>
         <logback.version>1.5.6</logback.version>
-        <slf4j.version>2.0.13</slf4j.version>
+        <slf4j.version>2.0.15</slf4j.version>
         <logstash.version>8.0</logstash.version>
         <jackson.version>2.17.2</jackson.version>
         <junit.version>5.10.3</junit.version>