docs: lgtm badge removal

LGTM no longer available and shut down.

Source: https://github.blog/2022-08-15-the-next-step-for-lgtm-com-github-code-scanning/

Author: phanak-sap

README.md

@@ -2,7 +2,6 @@
 ![Lint Status](https://github.com/SAP/python-pyodata/actions/workflows/python-linters.yml/badge.svg)
 [![PyPI version](https://badge.fury.io/py/pyodata.svg)](https://badge.fury.io/py/pyodata)
 [![codecov](https://codecov.io/gh/SAP/python-pyodata/branch/master/graph/badge.svg)](https://codecov.io/gh/SAP/python-pyodata)
-[![Total alerts](https://img.shields.io/lgtm/alerts/g/SAP/python-pyodata.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/SAP/python-pyodata/alerts/)
 [![REUSE status](https://api.reuse.software/badge/github.com/SAP/python-pyodata)](https://api.reuse.software/info/github.com/SAP/python-pyodata)
 
 # Python OData Client - pyodata