Remove reference to stale Coverity result

(cherry picked from commit 421dc66afb383950cc3b49bc6d57d69e50e518c1)

README.md

diff --git a/README.md b/README.md
index 9595a4d..f77a74d 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,6 @@
 
 [![Build status](https://github.com/glfw/glfw/actions/workflows/build.yml/badge.svg)](https://github.com/glfw/glfw/actions)
 [![Build status](https://ci.appveyor.com/api/projects/status/0kf0ct9831i5l6sp/branch/master?svg=true)](https://ci.appveyor.com/project/elmindreda/glfw)
-[![Coverity Scan](https://scan.coverity.com/projects/4884/badge.svg)](https://scan.coverity.com/projects/glfw-glfw)
 
 ## Introduction