Revert "Update curl/curl from curl-8_6_0 to curl-8_7_1"

This reverts commit 7c0841d.

Author: deriamis

config/software/curl.rb

@@ -16,7 +16,7 @@
 
 name 'curl'
 
-version = Gitlab::Version.new('curl', 'curl-8_7_1')
+version = Gitlab::Version.new('curl', 'curl-8_6_0')
 
 default_version version.print(false)
 display_version version.print(false).delete_prefix('curl-').tr('_', '.')