Ignore dependabot PRs for incompatible ANTLR4 versions (closes #118)

Change-Id: Ib901a3bb19d790e6bc1582f35e00dc9867e0b06d
Reviewed-on: https://korap.ids-mannheim.de/gerrit/c/KorAP/Koral/+/6050
Reviewed-by: Nils Diewald <nils@diewald-online.de>
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 7eca83d..6e1b251 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -9,3 +9,7 @@
     directory: "/"
     schedule:
       interval: "daily"
+    ignore:
+      - dependency-name: "org.antlr:antlr4-*"
+        versions:
+          - ">= 4.9.4"