Bump graalvm.version from 20.3.0 to 21.0.0 (#627)

Bumps `graalvm.version` from 20.3.0 to 21.0.0.

Updates `js` from 20.3.0 to 21.0.0
- [Release notes](https://github.com/graalvm/graaljs/releases)
- [Changelog](https://github.com/oracle/graaljs/blob/master/CHANGELOG.md)
- [Commits](oracle/graaljs@vm-20.3.0...vm-21.0.0)

Updates `js-scriptengine` from 20.3.0 to 21.0.0
- [Release notes](https://github.com/graalvm/graaljs/releases)
- [Changelog](https://github.com/oracle/graaljs/blob/master/CHANGELOG.md)
- [Commits](oracle/graaljs@vm-20.3.0...vm-21.0.0)

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

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

Author: dependabot[bot]

typescript-generator-core/pom.xml

@@ -18,7 +18,7 @@
         <jackson1.version>1.9.13</jackson1.version>
         <jackson2.version>2.12.1</jackson2.version>
         <jersey.version>3.0.1</jersey.version>
-        <graalvm.version>20.3.0</graalvm.version>
+        <graalvm.version>21.0.0</graalvm.version>
         <vavr.version>0.10.3</vavr.version>
     </properties>