[ci] upgrade bazel version to 6.5.0 (ray-project#45784)

and pin it to 6.5.0; rejects all other bazel version.

Signed-off-by: Lonnie Liu <[email protected]>

Author: aslonnie

.bazelversion

@@ -1 +1 @@
-5.4.1
+6.5.0

WORKSPACE

@@ -28,7 +28,10 @@ grpc_extra_deps()
 load("@bazel_skylib//lib:versions.bzl", "versions")
 
 # Please keep this in sync with the .bazelversion file.
-versions.check(minimum_bazel_version = "5.4.1")
+versions.check(
+    maximum_bazel_version = "6.5.0",
+    minimum_bazel_version = "6.5.0",
+)
 
 # Tools to generate `compile_commands.json` to enable awesome tooling of the C language family.
 # Just run `bazel run @hedron_compile_commands//:refresh_all`