Drop Python 3.9

[hynek]

❯ uvx pypistats python_minor
┌──────────┬─────────┬───────────────┐
│ category │ percent │     downloads │
├──────────┼─────────┼───────────────┤
│ 3.12     │  29.58% │ 1,358,073,100 │
│ 3.11     │  23.48% │ 1,077,927,736 │
│ 3.10     │  14.68% │   674,081,023 │
│ 3.13     │  14.03% │   644,064,074 │
│ 3.14     │   5.07% │   232,705,540 │
│ 3.9      │   4.94% │   226,684,815 │
│ null     │   3.05% │   140,159,099 │
│ 3.7      │   2.93% │   134,442,807 │
│ 3.8      │   1.93% │    88,589,228 │
│ 3.6      │   0.21% │     9,459,666 │
│ 2.7      │   0.08% │     3,655,230 │
│ 3.15     │   0.01% │       465,780 │
│ 3.5      │   0.01% │       397,163 │
│ 3.4      │   0.00% │        25,710 │
│ 3.16     │   0.00% │         4,170 │
│ 3.3      │   0.00% │            38 │
│ 3.2      │   0.00% │             3 │
│ 2.8      │   0.00% │             2 │
│ Total    │         │ 4,590,735,184 │
└──────────┴─────────┴───────────────┘

Date range: 2026-02-02 - 2026-08-01

We probably should have a look at the zip(..., strict=False) 😬