fix(docker): pip upgrade command removed (#218)

* Removed pip update command from docker build artifacts in cfn submit

Author: mmaeng

python/rpdk/python/codegen.py

@@ -246,17 +246,6 @@ def _build(self, base_path):
             self._pip_build(base_path)
         LOG.debug("Dependencies build finished")
 
-    @staticmethod
-    def _update_pip_command():
-        return [
-            "python",
-            "-m",
-            "pip",
-            "install",
-            "--upgrade",
-            "pip",
-        ]
-
     @staticmethod
     def _make_pip_command(base_path):
         return [
@@ -280,11 +269,7 @@ def _get_plugin_information() -> Dict:
     def _docker_build(cls, external_path):
         internal_path = PurePosixPath("/project")
         command = (
-            '/bin/bash -c "'
-            + " ".join(cls._update_pip_command())
-            + " && "
-            + " ".join(cls._make_pip_command(internal_path))
-            + '"'
+            '/bin/bash -c "' + " ".join(cls._make_pip_command(internal_path)) + '"'
         )
         LOG.debug("command is '%s'", command)