[librsvg/update-clap] Don't use ValueEnum - we aren't really using it now

[Federico Mena Quintero <federico src gnome org>]

commit f218113bbe4bb287e00b581043a765520a034569
Author: Federico Mena Quintero <federico gnome org>
Date:   Tue Sep 20 11:52:49 2022 -0500

    Don't use ValueEnum - we aren't really using it now

 src/bin/rsvg-convert.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/bin/rsvg-convert.rs b/src/bin/rsvg-convert.rs
index 3b2ebbfe4..bde6643d3 100644
--- a/src/bin/rsvg-convert.rs
+++ b/src/bin/rsvg-convert.rs
@@ -1,4 +1,4 @@
-use clap::{crate_version, ValueEnum};
+use clap::crate_version;
 
 use gio::prelude::*;
 use gio::{Cancellable, FileCreateFlags, InputStream, OutputStream};
@@ -473,7 +473,7 @@ impl std::fmt::Display for Output {
 }
 
 // Keep this enum in sync with supported_formats in parse_args()
-#[derive(ValueEnum, Clone, Copy, Debug)]
+#[derive(Clone, Copy, Debug)]
 enum Format {
     Png,
     Pdf,