Bump antlr4 from 4.7.1 to 4.7.2 (#4543)

Bumps [antlr4](https://github.com/antlr/antlr4) from 4.7.1 to 4.7.2.
- [Release notes](https://github.com/antlr/antlr4/releases)
- [Changelog](https://github.com/antlr/antlr4/blob/master/CHANGES.txt)
- [Commits](antlr/antlr4@4.7.1...4.7.2)

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

build.gradle

@@ -116,7 +116,7 @@ dependencies {
     antlr3 'org.antlr:antlr:3.5.2'
     compile 'org.antlr:antlr-runtime:3.5.2'
 
-    antlr4 'org.antlr:antlr4:4.7.1'
+    antlr4 'org.antlr:antlr4:4.7.2'
     compile 'org.antlr:antlr4-runtime:4.7.1'
 
     compile 'mysql:mysql-connector-java:8.0.13'