Make LenientFormatStringValidation a warning

PiperOrigin-RevId: 502649182
Change-Id: Ia69e5be9da817d7c25e51cad5086309515bb280a
diff --git a/tools/jdk/default_java_toolchain.bzl b/tools/jdk/default_java_toolchain.bzl
index 42c87d6..0324a50 100644
--- a/tools/jdk/default_java_toolchain.bzl
+++ b/tools/jdk/default_java_toolchain.bzl
@@ -55,6 +55,7 @@
     # https://github.com/bazelbuild/bazel/issues/16996
     "-Xep:IgnoredPureGetter:OFF",
     "-Xep:EmptyTopLevelDeclaration:OFF",
+    "-Xep:LenientFormatStringValidation:OFF",
 ]
 
 # Default java_toolchain parameters