Prevent msys2-runtime-devel from being upgraded

It has been overridden with a version that does not hang Git's test suite

This should have been part of ab74d76 (Prevent `msys2-runtime` from
being upgraded, 2024-12-30).

Signed-off-by: Johannes Schindelin <[email protected]>

Author: Git for Windows Build Agent

etc/pacman.conf

@@ -21,7 +21,7 @@ HoldPkg     = pacman
 Architecture = auto
 
 # Pacman won't upgrade packages listed in IgnorePkg and members of IgnoreGroup
-IgnorePkg   = msys2-runtime
+IgnorePkg   = msys2-runtime msys2-runtime-devel
 #IgnoreGroup =
 
 #NoUpgrade   =