Make aws/cloudflare depend on pmtiles from npm [#455] (#515)

* Make aws/cloudflare depend on pmtiles from npm [#455]

This is clearer to developers than relying on the local code being built.

* update check_examples.py
* bump openlayers to v2 with upgrade of pmtiles to v4 [#455]
* update to 4.2.1

openlayers/package.json

@@ -1,6 +1,6 @@
 {
   "name": "ol-pmtiles",
-  "version": "1.0.2",
+  "version": "2.0.0",
   "description": "PMTiles sources for OpenLayers",
   "type": "module",
   "main": "dist/cjs/index.cjs",
@@ -42,7 +42,7 @@
     "prettier-check": "prettier --check *.js"
   },
   "dependencies": {
-    "pmtiles": "^3.1.0"
+    "pmtiles": "^4.2.1"
   },
   "devDependencies": {
     "tsup": "^8.2.3",