refactor: Use requests.auth.HTTPBasicAuth

src/[[ tap_package_import_name ]]/[% if tap_stream_type == 'REST' %]client.py[% endif %].jinja

@@ -1,9 +1,4 @@
 [%- set base_stream = tap_source_id + 'Stream' -%]
-[%- set builtin_auth = {
-    "API Key": "APIKeyAuthenticator",
-    "Bearer Token": "BearerTokenAuthenticator",
-    "Basic Auth": "BasicAuthenticator",
-} -%]
 [%- set authenticator = tap_source_id + 'Authenticator' -%]
 
 """REST client handling, including [[ base_stream ]] base class."""
@@ -12,10 +7,16 @@ from __future__ import annotations
 
 from typing import Any
 
+[% if tap_auth_method == "Basic Auth" -%]
+from requests.auth import HTTPBasicAuth
+[% endif -%]
+
 from singer_sdk import [[ tap_stream_type ]]Stream
 
-[%- if tap_auth_method in builtin_auth %]
-from singer_sdk.authenticators import [[ builtin_auth[tap_auth_method] ]]
+[%- if tap_auth_method == "API Key" %]
+from singer_sdk.authenticators import APIKeyAuthenticator
+[%- elif tap_auth_method == "Bearer Token" %]
+from singer_sdk.authenticators import BearerTokenAuthenticator
 [%- endif %]
 
 [%- if tap_auth_method in ("OAuth2", "JWT") %]
@@ -77,20 +78,13 @@ class [[ base_stream ]]([[ tap_stream_type ]]Stream):
 [%- elif tap_auth_method == "Basic Auth" %]
 
     @property
-    def authenticator(self) -> BasicAuthenticator:
+    def authenticator(self) -> HTTPBasicAuth:
         """Get an authenticator object.
 
         Returns:
             The authenticator instance for this REST stream.
         """
-        username = self.config["username"]
-        password = self.config["password"]
-
-        return BasicAuthenticator.create_for_stream(
-            self,
-            username=username,
-            password=password,
-        )
+        return HTTPBasicAuth(self.config["username"], self.config["password"])
 
 [%- endif %]