README.md: update workflow status badge

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rust-lang · Feb 13, 2025 · 56c2b9b · 56c2b9b
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 # mdBook
 
-[![Build Status](https://github.com/rust-lang/mdBook/workflows/CI/badge.svg?event=push)](https://github.com/rust-lang/mdBook/actions?workflow=CI)
+[![CI Status](https://github.com/rust-lang/mdBook/actions/workflows/main.yml/badge.svg)](https://github.com/rust-lang/mdBook/actions/workflows/main.yml)
 [![crates.io](https://img.shields.io/crates/v/mdbook.svg)](https://crates.io/crates/mdbook)
 [![LICENSE](https://img.shields.io/github/license/rust-lang/mdBook.svg)](LICENSE)