Release v0.3.4 (#1894)

## Proposed Changes

Bump version to v0.3.4 and update dependencies with `cargo update`.


Co-authored-by: Michael Sproul <michael@sigmaprime.io>

scripts/change_version.sh

@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+
 # Change the version across multiple files, prior to a release. Use `sed` to
 # find/replace the exiting version with the new one.
 #