gha: bump depext opam binary

Author: rjbou

.github/workflows/depexts.yml

@@ -17,7 +17,7 @@ defaults:
     shell: bash
 
 env:
-  OPAMVERSION: 2.4.0-alpha2
+  OPAMVERSION: 2.4.1
   OPAM_REPO: https://github.com/ocaml/opam-repository.git
   OPAM_REPO_SHA: 3dab8c734b15bf2b5c1d8b99bb134f51361a6bee
 

master_changes.md

@@ -138,6 +138,7 @@ users)
   * Avoid re-testing already tested repositories when testing the revdeps [#6657 @kit-ty-kate]
   * Fix duplication logic in revdeps script [#6666 @arozovyk]
   * Remove patch dependency in depext actions [#6676 @rjbou]
+  * Bump opam binary used in depexts actions to 2.4.1 [#6676 @rjbou]
 
 ## Doc
   * Update the installation documentation with the release of opam 2.4.1 [#6620 @kit-ty-kate]