chore(deps): update dependency rules_proto to v6

Author: renovate[bot]

rules_haskell_tests/MODULE.bazel

@@ -77,7 +77,7 @@ bazel_dep(
 )
 bazel_dep(
     name = "rules_proto",
-    version = "5.3.0-21.7",
+    version = "6.0.0",
 )
 bazel_dep(
     name = "protobuf",