Remove srcs_version and python_version attributes, as they already default to "PY3"

PiperOrigin-RevId: 724138013

Author: oprypin

BUILD

@@ -1246,7 +1246,6 @@ tfrt_cc_library(
 # py_library(
 #     name = "btf_writer",
 #     srcs = ["utils/btf_writer.py"],
-#     srcs_version = "PY3",
 #     visibility = ["//visibility:public"],
 #     deps = ["//third_party/py/numpy"],
 # )

tools/BUILD

@@ -77,7 +77,6 @@ tfrt_cc_binary(
 # py_test(
 #     name = "btf_info_test",
 #     srcs = ["btf_info_tool/btf_info_test.py"],
-#     python_version = "PY3",
 #     deps = [
 #         ":btf_info",
 #         # Placeholder: proto upb dep