Bump resolverVersion from 1.9.18 to 1.9.20 (#55)

Bumps `resolverVersion` from 1.9.18 to 1.9.20.

Updates `org.apache.maven.resolver:maven-resolver-api` from 1.9.18 to 1.9.20
- [Release notes](https://github.com/apache/maven-resolver/releases)
- [Commits](apache/maven-resolver@maven-resolver-1.9.18...maven-resolver-1.9.20)

Updates `org.apache.maven.resolver:maven-resolver-util` from 1.9.18 to 1.9.20
- [Release notes](https://github.com/apache/maven-resolver/releases)
- [Commits](apache/maven-resolver@maven-resolver-1.9.18...maven-resolver-1.9.20)

Updates `org.apache.maven.resolver:maven-resolver-connector-basic` from 1.9.18 to 1.9.20
- [Release notes](https://github.com/apache/maven-resolver/releases)
- [Commits](apache/maven-resolver@maven-resolver-1.9.18...maven-resolver-1.9.20)

Updates `org.apache.maven.resolver:maven-resolver-transport-file` from 1.9.18 to 1.9.20
- [Release notes](https://github.com/apache/maven-resolver/releases)
- [Commits](apache/maven-resolver@maven-resolver-1.9.18...maven-resolver-1.9.20)

Updates `org.apache.maven.resolver:maven-resolver-transport-http` from 1.9.18 to 1.9.20

---
updated-dependencies:
- dependency-name: org.apache.maven.resolver:maven-resolver-api
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.apache.maven.resolver:maven-resolver-util
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.apache.maven.resolver:maven-resolver-connector-basic
  dependency-type: direct:development
  update-type: version-update:semver-patch
- dependency-name: org.apache.maven.resolver:maven-resolver-transport-file
  dependency-type: direct:development
  update-type: version-update:semver-patch
- dependency-name: org.apache.maven.resolver:maven-resolver-transport-http
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

pom.xml

@@ -73,7 +73,7 @@ under the License.
     <!-- Keep in sync with resolver used in maven above -->
     <slf4jVersion>1.7.36</slf4jVersion>
     <!-- Keep in sync with resolver used in maven above -->
-    <resolverVersion>1.9.18</resolverVersion>
+    <resolverVersion>1.9.20</resolverVersion>
 
     <!-- plugins version used in IT tests -->
     <mavenAntrunPluginVersion>${version.maven-antrun-plugin}</mavenAntrunPluginVersion>