ci(python): add Python 3.14 to tested configurations

[severinstrobl]

No description provided.

[overlap-benchmarks]

C++ benchmark results

Benchmark	Reference (a52b169)	Current (f5ac735)
construction[hex]	963 ns	1.14 us: 1.18x slower
construction[tet]	338 ns	397 ns: 1.17x slower
construction[wedge]	663 ns	782 ns: 1.18x slower
hex_overlap_volume[AABB]	7.72 ns	7.91 ns: 1.02x slower
hex_overlap_volume[hex-in-sphere]	17.5 ns	18.5 ns: 1.06x slower
hex_overlap_volume[random]	1.03 us	1.08 us: 1.05x slower
hex_overlap_volume[sphere-in-hex]	700 ns	713 ns: 1.02x slower
normal_newell	56.8 ns	65.3 ns: 1.15x slower
regularized_wedge	60.7 ns	64.2 ns: 1.06x slower
tet_overlap_volume[AABB]	4.99 ns	4.92 ns: 1.01x faster
tet_overlap_volume[hex-in-sphere]	10.1 ns	10.6 ns: 1.06x slower
tet_overlap_volume[sphere-in-hex]	1.49 us	1.56 us: 1.05x slower
Geometric mean	(ref)	1.08x slower

Python benchmark results

Benchmark	Reference	Current
hex_overlap_volume[sphere-in-hex]	2.48 us	2.42 us: 1.02x faster
hex_overlap_volume[hex-in-sphere]	1.73 us	1.68 us: 1.03x faster
hex_overlap_volume[AABB]	1.70 us	1.65 us: 1.03x faster
tet_overlap_volume[sphere-in-tet]	1.29 us	1.17 us: 1.11x faster
tet_overlap_volume[tet-in-sphere]	307 ns	290 ns: 1.06x faster
tet_overlap_volume[AABB]	286 ns	278 ns: 1.03x faster
construction[tet]	3.23 us	3.00 us: 1.07x faster
construction[wedge]	4.34 us	4.06 us: 1.07x faster
construction[hex]	5.59 us	5.24 us: 1.07x faster
hex_overlap_volume[random]	10.5 us	9.74 us: 1.07x faster
Geometric mean	(ref)	1.06x faster