build: rebase patches onto v0.21.9

patches/0015-Use-the-desktop-s-file-picker-on-Linux.patch

@@ -17,7 +17,7 @@ Windows and macOS already use the native pickers.
  1 file changed, 10 insertions(+)
 
 diff --git a/apps/app/src/main.rs b/apps/app/src/main.rs
-index 04eedbd..4c269a3 100644
+index 96cc15a..6ca3c2b 100644
 --- a/apps/app/src/main.rs
 +++ b/apps/app/src/main.rs
 @@ -115,6 +115,16 @@ async fn set_restart_after_pending_update(
@@ -34,6 +34,6 @@ index 04eedbd..4c269a3 100644
 +        unsafe { std::env::set_var("GTK_USE_PORTAL", "1") };
 +    }
 +
-     #[cfg(feature = "export-app-events")]
-     theseus::export_app_event_bindings(
-         std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+     let runtime = tokio::runtime::Builder::new_multi_thread()
+         .enable_all()
+         .build()