style(bazel): use template suffix for Rust BUILD template

MODULE.bazel.lock

@@ -93,7 +93,7 @@
   "moduleExtensions": {
     "//bazel:rust.bzl%rust": {
       "general": {
-        "bzlTransitiveDigest": "4aaA6vAtrGES73j6RWZFmf/31/0PAazCSNi2ccK0w0E=",
+        "bzlTransitiveDigest": "4kUzQyjRjzchWIBZJKkNs8LuO4F+g/DwuwtTa0RTPcU=",
         "usagesDigest": "jJoM2Hp1NbshT//puE4xIUfXdA0K6BRx1WTlsZIKFm4=",
         "recordedFileInputs": {},
         "recordedDirentsInputs": {},

bazel/BUILD

@@ -1,5 +1,5 @@
 exports_files([
-    "rust.BUILD.tpl",
+    "rust.BUILD.template",
     "rust.bzl",
     "utils.bzl",
 ])

bazel/rust.bzl

@@ -27,7 +27,7 @@ def _rust_repository_impl(repository_ctx):
     repository_ctx.file("WORKSPACE.bazel", "")
     repository_ctx.template(
         "BUILD.bazel",
-        Label("//bazel:rust.BUILD.tpl"),
+        Label("//bazel:rust.BUILD.template"),
         {
             "{host_triple}": host_triple,
             "{release}": release,