bump to 0.14.2

bump dependencies

Add semver

Implement tile caching (#1105)

Add a top level config parameter -- the size of cache memory (in MB) to
use for caching tiles and PMT directories, defaulting to 512, and 0 to
disable. This also removes the `pmtiles.dir_cache_size_mb` parameter (it
will be ignored, but will give a warning)

```
cache_size_mb: 512
```

The new cache will contain all tiles as provided by the source. So if
PostgreSQL returns a non-compressed tile, the cache will contain the
uncompressed variant, and will be compressed for each response. This
will be fixed in the later releases.

Note that fonts and sprites are not cached at this time, and are still a
TODO.

fix debian config example

bump martin version

CI fixes

bump lock

bump lock

fix long bounds calculation message