build(deps): Bump slf4jVersion from 2.0.19 to 2.0.20

Bumps `slf4jVersion` from 2.0.19 to 2.0.20.

Updates `org.slf4j:slf4j-api` from 2.0.19 to 2.0.20

Updates `org.slf4j:slf4j-simple` from 2.0.19 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
...

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

Author: dependabot[bot]

build.gradle

@@ -15,7 +15,7 @@ plugins {
 ext {
     seleniumVersion = project.property('selenium.version')
     appiumClientVersion = project.property('appiumClient.version')
-    slf4jVersion = '2.0.19'
+    slf4jVersion = '2.0.20'
 }
 
 group = 'io.appium'