Bump antlr4.version from 4.9.2 to 4.9.3

Bumps `antlr4.version` from 4.9.2 to 4.9.3.

Updates `antlr4-runtime` from 4.9.2 to 4.9.3
- [Release notes](https://github.com/antlr/antlr4/releases)
- [Changelog](https://github.com/antlr/antlr4/blob/master/CHANGES.txt)
- [Commits](https://github.com/antlr/antlr4/compare/4.9.2...4.9.3)

Updates `antlr4-maven-plugin` from 4.9.2 to 4.9.3
- [Release notes](https://github.com/antlr/antlr4/releases)
- [Changelog](https://github.com/antlr/antlr4/blob/master/CHANGES.txt)
- [Commits](https://github.com/antlr/antlr4/compare/4.9.2...4.9.3)

---
updated-dependencies:
- dependency-name: org.antlr:antlr4-runtime
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.antlr:antlr4-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Change-Id: I92b58dc25e47b4c6034f2badb62d04b4b41cb591
Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/pom.xml b/pom.xml
index b6e74d5..4fb8124 100644
--- a/pom.xml
+++ b/pom.xml
@@ -37,7 +37,7 @@
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>		
 		<jackson.version>[2.9.5,)</jackson.version>
-		<antlr4.version>4.9.2</antlr4.version>
+		<antlr4.version>4.9.3</antlr4.version>
 		<antlr3.version>3.5.2</antlr3.version>
 		<java.version>1.8</java.version>
 		<log4j.version>2.14.1</log4j.version>