Fix Error Prone by downgrading to 2.16.

Change-Id: Ic267ab33d07bd2f4bbb505e9e88e110fd0e8c346
Tested-by: Marge Bot <https://gitlab.benkard.de/mulk/jgvariant/-/merge_requests/18>
Part-of: <https://gitlab.benkard.de/mulk/jgvariant/-/merge_requests/18>
diff --git a/jgvariant-parent/pom.xml b/jgvariant-parent/pom.xml
index ff1e4f8..08afa85 100644
--- a/jgvariant-parent/pom.xml
+++ b/jgvariant-parent/pom.xml
@@ -69,7 +69,7 @@
     <versions-plugin.version>2.14.2</versions-plugin.version>
 
     <apiguardian.version>1.1.2</apiguardian.version>
-    <errorprone.version>2.17.0</errorprone.version>
+    <errorprone.version>2.16</errorprone.version>
     <error-prone-support.version>0.6.0</error-prone-support.version>
     <google-java-format.version>1.15.0</google-java-format.version>
     <inject-resources.version>0.3.2</inject-resources.version>