Bump slf4j from 2.0.18 to 2.0.20 (#1888)

Bumps `slf4j` from 2.0.18 to 2.0.20.

Updates `org.slf4j:slf4j-api` from 2.0.18 to 2.0.20

Updates `org.slf4j:slf4j-simple` from 2.0.18 to 2.0.20

---
updated-dependencies:
- dependency-name: org.slf4j:slf4j-api
  dependency-version: 2.0.20
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.slf4j:slf4j-simple
  dependency-version: 2.0.20
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

gradle/libs.versions.toml

@@ -63,7 +63,7 @@ nullawayPlugin = "3.0.0"
 nuValidator = "26.7.3"
 paguro = "3.10.3"
 shadowPlugin = "9.5.1"
-slf4j = "2.0.18"
+slf4j = "2.0.20"
 snakeYaml = "3.0.1"
 spotlessPlugin = "8.8.0"
 wiremock = "3.13.2"