chore(deps-dev): Bump mypy from 0.931 to 0.940

Bumps mypy from 0.931 to 0.940.

Commits

• 48ff811 Bump version to 0.940
• 7390280 Trigger wheel builds
• 942395a Minor documentation updates (#12329)
• 5954bc9 Update copyright in LICENSE (#12330)
• 8650f5c stubgen: fix non default keyword-only argument positioning (#12303)
• 226661f Exhaustiveness checking for match statements (#12267)
• fce1b54 CI: Do not run mypy_primer on stubtest/stubgen PRs (#12295)
• c7a8162 stubtest: ignore more dunder positional-only errors (#12294)
• b3752a6 Revert "stubtest pos-only differences in dunders (#12184)" (#12293)
• 4d99f7c teststubtest: further fix tests (#12287)
• Additional commits viewable in compare view