Pass tests on Apple silicon

[jchamberlain]

Tegola's tests don't pass on M1/M2 Macs for two reasons:

1. Many calculated floats are slightly (insignificantly) different, but SQL string comparisons in the PostGIS and Hana providers expect an exact match.
2. TestGenerateTilesForBounds fails because of a bug in go-spatial/geom (uint overflow, resulting in implementation-specific behavior—see cmd/compile: casting a negative float to uint64 has different behavior on arm64 and amd64 golang/go#52943). The geom code in question has since been rewritten and does not exhibit the same bug, so upgrading fixes it.

From my perspective, (2) is best fixed by upgrading go-spatial/geom. But that introduces its own trouble in that some float calculations are even more different (exacerbating 1), and backward-incompatible changes have been made.

[jchamberlain]

With the two PRs merged, tests are now passing on my M1 Mac. Thank you!