feat!: drop python 3.8 support

[onerandomusername]

Summary

drops support for python 3.8

In addition, updates all of the typehints.

This pull should be merged with a merge or rebase strategy, to allow for us to ignore only the typehint update in .git-blame-ignore-revs. We should not be ignoring the min bump.

^ These typehint changes have been moved to #1396

Dependencies will be bumped separately.

There is a pull that updates typing within the documentation, see #1395. Do note that pull is not breaking and does not require this pull.

Checklist

• If code changes were made, then they have been tested
  • I have updated the documentation to reflect the changes
  • I have formatted the code properly by running pdm run nox -s lint
  • I have type-checked the code by running pdm run nox -s pyright
• This PR fixes an issue
• This PR adds something new (e.g. new method or parameters)
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)

[read-the-docs-community]

Documentation build overview

📚 disnake | 🛠️ Build #29723114 | 📁 Comparing 051273b against latest (731eda1)

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Show files changed (49 files in total): 📝 49 modified | ➕ 0 added | ➖ 0 deleted

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[shiftinv]

A couple things:

• If it's not too much trouble, could you move the annotation changes to another PR? To keep this one limited to actual runtime differences and metadata/CI changes. Would be cool c:
• While it's technically still got ~5 weeks until EOL, we might as well drop 3.9 here too, and avoid having to do all the steps twice. The next release containing this PR won't come out within that time frame, anyhow.

[onerandomusername]

Done @shiftinv

[onerandomusername]

@shiftinv this is ready for review, if you could give it a lookover. I want to drop python 3.8 asap.

[shiftinv]

One more mention of 3.8 I could find:

disnake/noxfile.py

Lines 2 to 3 in a7a87c1

	# /// script
	# requires-python = ">=3.8"

other than that, lgtm c: