Please mypy

Mypy doesn't like some annotation in web.py,
this commits aims at pleasing it.
10 jobs for master in 2 minutes and 9 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Linting
passed linting:bandit #122119

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passed linting:codespell #122120

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passed linting:mypy #122123

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passed linting:pyflakes #122122

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passed linting:pylint #122121

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  Test
passed tests:archlinux #122124

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passed tests:debian #122125

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passed tests:debian_with_bubblewrap #122126

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100.0%
passed tests:fedora #122127

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passed tests:gentoo #122128

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