readme: fix codecov badge (#19112)

(cherry picked from commit cc00229)

README.md

@@ -27,7 +27,7 @@ ______________________________________________________________________
 [![PyPI Status](https://badge.fury.io/py/pytorch-lightning.svg)](https://badge.fury.io/py/pytorch-lightning)
 [![PyPI - Downloads](https://img.shields.io/pypi/dm/pytorch-lightning)](https://pepy.tech/project/pytorch-lightning)
 [![Conda](https://img.shields.io/conda/v/conda-forge/lightning?label=conda&color=success)](https://anaconda.org/conda-forge/lightning)
-[![codecov](https://codecov.io/gh/Lightning-AI/lightning/branch/master/graph/badge.svg?token=SmzX8mnKlA)](https://codecov.io/gh/Lightning-AI/lightning)
+[![codecov](https://codecov.io/gh/Lightning-AI/pytorch-lightning/graph/badge.svg?token=SmzX8mnKlA)](https://codecov.io/gh/Lightning-AI/pytorch-lightning)
 
 [![Discord](https://img.shields.io/discord/1077906959069626439?style=plastic)](https://discord.gg/VptPCZkGNa)
 ![GitHub commit activity](https://img.shields.io/github/commit-activity/w/lightning-ai/lightning)

src/pytorch_lightning/README.md

@@ -25,7 +25,7 @@ ______________________________________________________________________
 [![PyPI - Downloads](https://img.shields.io/pypi/dm/pytorch-lightning)](https://pepy.tech/project/pytorch-lightning)
 [![Conda](https://img.shields.io/conda/v/conda-forge/pytorch-lightning?label=conda&color=success)](https://anaconda.org/conda-forge/pytorch-lightning)
 [![DockerHub](https://img.shields.io/docker/pulls/pytorchlightning/pytorch_lightning.svg)](https://hub.docker.com/r/pytorchlightning/pytorch_lightning)
-[![codecov](https://codecov.io/gh/Lightning-AI/lightning/branch/master/graph/badge.svg)](https://codecov.io/gh/Lightning-AI/lightning)
+[![codecov](https://codecov.io/gh/Lightning-AI/pytorch-lightning/graph/badge.svg?token=SmzX8mnKlA)](https://codecov.io/gh/Lightning-AI/pytorch-lightning)
 
 [![ReadTheDocs](https://readthedocs.org/projects/pytorch-lightning/badge/?version=stable)](https://lightning.ai/docs/pytorch/stable/)[![Discord](https://img.shields.io/discord/1077906959069626439?style=plastic)](https://discord.gg/VptPCZkGNa)
 [![license](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://github.com/Lightning-AI/lightning/blob/master/LICENSE)