Bump org.eclipse.microprofile.openapi:microprofile-openapi-api

Bumps [org.eclipse.microprofile.openapi:microprofile-openapi-api](https://github.com/eclipse/microprofile-open-api) from 3.1.1 to 4.0.
- [Release notes](https://github.com/eclipse/microprofile-open-api/releases)
- [Commits](microprofile/microprofile-open-api@3.1.1...4.0)

---
updated-dependencies:
- dependency-name: org.eclipse.microprofile.openapi:microprofile-openapi-api
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

lib/build.gradle

@@ -3,7 +3,7 @@ plugins {
 }
 
 dependencies {
-    implementation 'org.eclipse.microprofile.openapi:microprofile-openapi-api:3.1.1'
+    implementation 'org.eclipse.microprofile.openapi:microprofile-openapi-api:4.0'
     testImplementation 'org.slf4j:slf4j-jdk14:2.0.16'
     testImplementation 'org.openapitools.empoa:empoa-simple-models-impl:2.1.0'
     testImplementation 'nl.jqno.equalsverifier:equalsverifier:3.16.1'