Update packages script

bin/examples-update-packages.sh

···
+#!/bin/sh
+
+set -eu
+
+for project in examples/*; do
+  if [ ! -f "$project/gleam.toml" ]; then
+    continue
+  fi
+
+  echo "Updating dependencies for $project"
+  cd "$project"
+  gleam update
+  gleam test || true
+  cd ../..
+done