Add a script for updating lock files

Every time one of the dependencies is explicitly changed we have to
update the minimal/recent lock files. Add a script to do so.

contrib/update-lock-files.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+#
+# Update the minimal/recent lock file
+
+set -euo pipefail
+
+for file in Cargo-minimal.lock Cargo-recent.lock; do
+    cp --force "$file" Cargo.lock
+    cargo check
+    cp --force Cargo.lock "$file"
+done