Update antlr4 to v4.12.0 (#2103)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

gradle/libs.versions.toml

@@ -23,7 +23,7 @@ auto-value = "1.10.1"
 findbugs = "3.0.2"
 rhino-runtime = "1.7.14"
 zstd-jni = "1.4.8-1" # Not latest as it can be difficult to obtain latest ZSTD libs
-antlr4 = "4.11.1"
+antlr4 = "4.12.0"
 json-simple = "1.1.1"
 jlibnoise = "1.0.0"
 jchronic = "0.2.4a"