Prepare for v6.6. (#1287)

Author: jin

MODULE.bazel

@@ -1,6 +1,6 @@
 module(
     name = "rules_jvm_external",
-    version = "6.5",
+    version = "6.6",
     bazel_compatibility = [">=7.0.0"],
 )
 

README.md

@@ -100,7 +100,7 @@ Support for Bazel versions before `4.0.0` is only available on rules_jvm_externa
 
 ## Usage
 
-### With bzlmod (Bazel 7 and above)
+### Recommended: bzlmod (Bazel 7 and above)
 
 If you are starting a new project, or your project is already using Bazel 7 and
 above, we recommend using [`bzlmod`](https://bazel.build/external/overview) to
@@ -114,6 +114,8 @@ on-by-default in Bazel 7.0.
 
 ### With WORKSPACE file (legacy)
 
+NOTE: WORKSPACE support is disabled by default in Bazel 8.0, and will be removed in Bazel 9.0.
+
 List the top-level Maven artifacts and servers in the WORKSPACE:
 
 ```python