Bump graalvm.version from 20.3.0 to 21.0.0

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](https://github.com/graalvm/graaljs/compare/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](https://github.com/graalvm/graaljs/compare/vm-20.3.0...vm-21.0.0)

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/pom.xml b/pom.xml
index 1f5520d..cc00332 100644
--- a/pom.xml
+++ b/pom.xml
@@ -57,7 +57,7 @@
     <commons.jacoco.version>0.8.6</commons.jacoco.version>
     <commons.javadoc.version>3.2.0</commons.javadoc.version>
 
-    <graalvm.version>20.3.0</graalvm.version>
+    <graalvm.version>21.0.0</graalvm.version>
 
     <commons.japicmp.version>0.15.2</commons.japicmp.version>
     <japicmp.skip>false</japicmp.skip>
diff --git a/src/changes/changes.xml b/src/changes/changes.xml
index 0a9a0ba..b877677 100644
--- a/src/changes/changes.xml
+++ b/src/changes/changes.xml
@@ -66,7 +66,7 @@
     <action                  type="update" dev="kinow" due-to="Dependabot">Bump commons-parent from 51 to 52 #145.</action>
     <action                  type="update" dev="kinow" due-to="Dependabot">Bump actions/checkout from v1 to v2.3.4 #138 #146 #165 #183.</action>
     <action                  type="update" dev="kinow" due-to="Dependabot">Bump maven-pmd-plugin from 3.13.0 to 3.14.0 #186.</action>
-    <action                  type="update" dev="ggregory" due-to="Dependabot">Bump graalvm.version from 20.2.0 to 20.3.0 #185.</action>
+    <action                  type="update" dev="ggregory" due-to="Dependabot">Bump graalvm.version from 20.2.0 to 21.0.0 #185 #198.</action>
     <action                  type="update" dev="ggregory" due-to="Arturo Bernal">Minor Improvements #192.</action>
     <action                  type="update" dev="ggregory" due-to="Gary Gregory">Update commons.japicmp.version 0.14.3 -> 0.15..</action>
     <action                  type="update" dev="ggregory" due-to="Gary Gregory">Update commons.jacoco.version 0.8.5 to 0.8.6; fixes Java 15 build.</action>