Bump slf4j from 1.7.36 to 2.0.12

Bumps `slf4j` from 1.7.36 to 2.0.12.

Updates `org.slf4j:slf4j-api` from 1.7.36 to 2.0.12

Updates `org.slf4j:slf4j-nop` from 1.7.36 to 2.0.12

---
updated-dependencies:
- dependency-name: org.slf4j:slf4j-api
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.slf4j:slf4j-nop
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

gradle/libs.versions.toml

@@ -9,7 +9,7 @@ objenesis = '3.3'
 rxjava = '1.3.8'
 rxjava2 = '2.2.21'
 sitemesh = '2.4.4'
-slf4j = '1.7.36'
+slf4j = '2.0.12'
 spock = '2.1-groovy-3.0'
 spring = '5.3.31'