fix: textconf programs are now always run through a shell.

This is based on what Git does, see git/git@41a457e .

This originally surfaced in gitbutlerapp/gitbutler#9540 .

Author: Byron

gix-diff/src/blob/pipeline.rs

@@ -549,7 +549,7 @@ impl Driver {
         let cmd = gix_command::prepare(gix_path::from_bstr(command).into_owned())
             // TODO: Add support for an actual Context, validate it *can* match Git
             .with_context(Default::default())
-            .command_may_be_shell_script()
+            .with_shell()
             .stdin(Stdio::null())
             .stdout(Stdio::piped())
             .stderr(Stdio::piped())