docs: remove Maven version badge from README

It still shows 3.4.0 while the newest version is 3.6.0. It's broken, and it just repeats what GitHub shows to the users in the Releases section.

Author: krzema12

README.md

@@ -2,7 +2,6 @@
 ![Logo white](images/Logo-Black.svg#gh-light-mode-only)
 
 <!-- maven coordinates -->
-[![Maven Central](https://maven-badges.herokuapp.com/maven-central/io.github.typesafegithub/github-workflows-kt/badge.svg)](https://maven-badges.herokuapp.com/maven-central/io.github.typesafegithub/github-workflows-kt)
 [![Awesome Kotlin Badge](https://kotlin.link/awesome-kotlin.svg)](https://github.com/KotlinBy/awesome-kotlin)
 [![GitHub Repo stars](https://img.shields.io/github/stars/typesafegithub/github-workflows-kt)](https://star-history.com/#typesafegithub/github-workflows-kt&Date)
 [![License](https://img.shields.io/github/license/typesafegithub/github-workflows-kt)](https://github.com/typesafegithub/github-workflows-kt/blob/main/LICENSE)