[openstreetmap/openstreetmap-website] Vendorer fails due to new GitHub security improvements (Issue #3415)

[Dakota Benjamin]

### Description

I was building openstreetmap-website using [OSM Seed](https://github.com/developmentseed/osm-seed/) and received an error while running the vendorer. 

```
/var/.gem/ruby/gems/vendorer-0.2.0/lib/vendorer.rb:92:in `run': Failed: git clone git://github.com/aratcliffe/Leaflet.contextmenu.git /tmp/d20220111-9-1y7dtc1 2>&1 (RuntimeError)
Cloning into '/tmp/d20220111-9-1y7dtc1'...
fatal: remote error: 
  The unauthenticated git protocol on port 9418 is no longer supported.
Please see https://github.blog/2021-09-01-improving-git-protocol-security-github/ for more information.
```

The Vendorer file contains references to github repos using the git:// protocol, which is not supported anymore. I tested changing them all to `https://` instead and that worked for me. I don't know if the Vendorer is used in production, but I am happy to make a PR if that would be worthwhile. 

### Screenshots

_No response_

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