Bump xercesImpl from 2.12.0 to 2.12.2 in /errai-bom (#440)

Bumps xercesImpl from 2.12.0 to 2.12.2.

---
updated-dependencies:
- dependency-name: xerces:xercesImpl
  dependency-type: direct:production
...

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errai-bom/pom.xml

@@ -151,7 +151,7 @@
     <version.org.wildfly.core>15.0.1.Final</version.org.wildfly.core>
     <!-- The version of xercesImpl in the ip-bom is not published on Maven Central.
          Removing this override breaks Errai apps that don't have the JBoss nexus repository configured. -->
-    <version.xerces.xercesImpl>2.12.0</version.xerces.xercesImpl>
+    <version.xerces.xercesImpl>2.12.2</version.xerces.xercesImpl>
     <version.xml-apis>1.4.01</version.xml-apis>
   </properties>