Bump org.slf4j:slf4j-simple from 2.0.11 to 2.0.12

Bumps org.slf4j:slf4j-simple from 2.0.11 to 2.0.12.

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

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

build.gradle

@@ -76,7 +76,7 @@ dependencies {
     testImplementation('com.icegreen:greenmail:2.0.1') {
         exclude group: 'junit'
     }
-    testImplementation 'org.slf4j:slf4j-simple:2.0.11'
+    testImplementation 'org.slf4j:slf4j-simple:2.0.12'
 }
 
 test {