Bump shipkit-changelog from 1.1.15 to 1.2.0 (#2654)

Bumps shipkit-changelog from 1.1.15 to 1.2.0.

---
updated-dependencies:
- dependency-name: org.shipkit:shipkit-changelog
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

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

build.gradle

@@ -10,7 +10,7 @@ buildscript {
         classpath 'net.ltgt.gradle:gradle-errorprone-plugin:2.0.2'
 
         classpath "io.github.gradle-nexus:publish-plugin:1.1.0"
-        classpath 'org.shipkit:shipkit-changelog:1.1.15'
+        classpath 'org.shipkit:shipkit-changelog:1.2.0'
         classpath 'org.shipkit:shipkit-auto-version:1.2.0'
 
         classpath 'com.google.googlejavaformat:google-java-format:1.15.0'