Bump org.openapitools.openapidiff:openapi-diff-core

Bumps [org.openapitools.openapidiff:openapi-diff-core](https://github.com/OpenAPITools/openapi-diff) from 2.1.0-beta.12 to 2.1.1.
- [Release notes](https://github.com/OpenAPITools/openapi-diff/releases)
- [Commits](OpenAPITools/openapi-diff@2.1.0-beta.12...2.1.1)

---
updated-dependencies:
- dependency-name: org.openapitools.openapidiff:openapi-diff-core
  dependency-version: 2.1.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

boat-maven-plugin/pom.xml

@@ -52,7 +52,7 @@
         <dependency>
             <groupId>org.openapitools.openapidiff</groupId>
             <artifactId>openapi-diff-core</artifactId>
-            <version>2.1.0-beta.12</version>
+            <version>2.1.1</version>
         </dependency>
 
         <dependency>