Bump version.elemental2 from 1.2.0 to 1.2.1

Bumps `version.elemental2` from 1.2.0 to 1.2.1.

Updates `com.google.elemental2:elemental2-core` from 1.2.0 to 1.2.1
- [Release notes](https://github.com/google/elemental2/releases)
- [Commits](google/elemental2@1.2.0...1.2.1)

Updates `com.google.elemental2:elemental2-dom` from 1.2.0 to 1.2.1
- [Release notes](https://github.com/google/elemental2/releases)
- [Commits](google/elemental2@1.2.0...1.2.1)

Updates `com.google.elemental2:elemental2-webstorage` from 1.2.0 to 1.2.1
- [Release notes](https://github.com/google/elemental2/releases)
- [Commits](google/elemental2@1.2.0...1.2.1)

---
updated-dependencies:
- dependency-name: com.google.elemental2:elemental2-core
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: com.google.elemental2:elemental2-dom
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: com.google.elemental2:elemental2-webstorage
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -96,7 +96,7 @@
     <properties>
         <!-- Dependency versions -->
         <version.checkstyle.config>1.0.8.Final</version.checkstyle.config>
-        <version.elemental2>1.2.0</version.elemental2>
+        <version.elemental2>1.2.1</version.elemental2>
         <version.gwt.event>1.0.0-RC1</version.gwt.event>
         <version.gwt.safehtml>1.0.0-RC1</version.gwt.safehtml>
         <version.junit>5.10.0</version.junit>