[openstreetmap/openstreetmap-website] Upgrade to bootstrap 5.2 (PR #4099)

[Andy Allan]

` bundle exec rails assets:precompile` failed in the CI tests, and I could recreate that locally too. I think I had to clear my local cache to trigger it though.

The error message is the same as previously, namely:

```
SassC::SyntaxError: Error: Custom property values may not be empty.
        on line 1:69677 of stdin
>> t-size:1.25rem;--bs-navbar-toggler-icon-bg:url("data:image/svg+xml,%3csvg xm
```

This indicates that libsass is trying to parse it's own compressed output, which hits a bug in libsass. This is what #4088 was trying to fix - it avoided the reparsing for the main stylesheet by doing everything in one pass, and so it now works for development and testing (when running the tests without precompiling). 

I haven't figured out why the precompile step trips up, but I suspect it's something to do with merging even more stylesheets together (e.g. the leaflet or iD stylesheets or something like that) which triggers reparsing our main stylesheet.

https://github.com/gravitystorm/openstreetmap-website/issues/268 has some more details about all the different libsass vs sassc-rails vs dartsass etc - to help keep it straight in my own head!

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