Bump groovy-all from 2.4.13 to 2.4.20 (#526)

Bumps [groovy-all](https://github.com/apache/groovy) from 2.4.13 to 2.4.20.
- [Release notes](https://github.com/apache/groovy/releases)
- [Commits](https://github.com/apache/groovy/commits)

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

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

Author: dependabot[bot]

typescript-generator-gradle-plugin/pom.xml

@@ -44,7 +44,7 @@
         <dependency>
             <groupId>org.codehaus.groovy</groupId>
             <artifactId>groovy-all</artifactId>
-            <version>2.4.13</version>
+            <version>2.4.20</version>
         </dependency>
         <dependency>
             <groupId>cz.habarta.typescript-generator</groupId>