Correct BValue typing

[moreal]

In Mypy development build (master branch), it became to support recursive types. (See python/mypy#731 (comment), python/mypy#13297).

This pull request makes the bencodex-python package apply it with the development build.

[dahlia]

By the way, if this patch requires a bleeding-edge version of Mypy, does it mean consumers who use both this package and Mypy also need to install the same (or higher) version of Mypy?

[moreal]

By the way, if this patch requires a bleeding-edge version of Mypy, does it mean consumers who use both this package and Mypy also need to install the same (or higher) version of Mypy?

Yes. Because it requires bleeding-edge version of Mypy, it may be better to turn this pull request as draft until a new Mypy release introduced.

[dahlia]

The last release of Mypy (0.971 in 2022-07-19) took about two months after its previous release (0.960 in 2022-05-16). Hmm… IMHO it's likely to be soon, and we could wait for the next release!

[dahlia]

@moreal Mypy 0.981 which introduced general recursive types was released today. Let's upgrade Mypy to 0.981!

[pull-request-quantifier-deprecated]

This PR has 18 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Label      : Extra Small
Size       : +12 -6
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Total files changed: 4

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.rst : +2 -0
.py : +8 -4
.ini : +2 -2

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