Update resolution for floats in tests

[hoxbro]

Fixes https://github.com/holoviz/spatialpandas/issues/152

The original example came down to this:

ax0 = 1.0
ay0 = -16.0
ax1 = 0.0
ay1 = 0.0

bx0 = 0.0
by0 = -1e-15
bx1 = 0.0
by1 = -1.0

triangle_orientation(ax0, -16.0, ax1, ay1, bx0, by0), triangle_orientation(ax0, -17.0, ax1, ay1, bx0, by0)  #Returns True, False

Which could further be reduced to this precision problem:

Now, we round the floats to one above the computer precision of numpy floats (for me, 15).

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 77.47%. Comparing base (81c841a) to head (31f2fa4). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #157 +/- ## ======================================= Coverage 77.46% 77.47% ======================================= Files 50 50 Lines 4842 4843 +1 ======================================= + Hits 3751 3752 +1 Misses 1091 1091 ```

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