Add deprecation warnings to 2.24 about scie-pants/Python 3.11

[huonw]

I'm not opposed to some sort of warn-but-not-too-often in 2.24, I'm just not sure exactly what that looks like. Best effort to do something by 2.24.0 as we learn more in main sounds okay to me.

Originally posted by @cburroughs in #21528 (comment)

[huonw]

Case report: running with a too old scie-pants on my machine gave this error:

Failed to fetch https://github.com/pantsbuild/pants/releases/download/release_2.25.0.dev0/pants.2.25.0.dev0-cp39-darwin_arm64.pex: [22] HTTP response code said error (The requested URL returned error: 404)
Wasn't able to fetch the Pants PEX at https://github.com/pantsbuild/pants/releases/download/release_2.25.0.dev0/pants.2.25.0.dev0-cp39-darwin_arm64.pex.

Check to see if the URL is reachable (i.e. GitHub isn't down) and if pants.2.25.0.dev0-cp39-darwin_arm64.pex asset exists within the release. If the asset doesn't exist it may be that this platform isn't yet supported. If that's the case, please reach out on Slack: https://www.pantsbuild.org/docs/getting-help#slack or file an issue on GitHub: https://github.com/pantsbuild/pants/issues/new/choose.

Exception:

Command '['/Users/huon/Library/Caches/nce/161eac8bd1cd5862947ecfaaa25e9c9fea11cede0c697ae76f76f0b4789e2da5/ptex-macos-aarch64', 'https://github.com/pantsbuild/pants/releases/download/release_2.25.0.dev0/pants.2.25.0.dev0-cp39-darwin_arm64.pex']' returned non-zero exit status 1.
Error: Failed to establish atomic directory /Users/huon/Library/Caches/nce/f46d2c12132bad9c27e0dd509186c190371abfe1add7e5ca42245466f35bea81/locks/install-dfd5d377be1d503206740187809bf4b2c3b2e3c9d1911cfa26254264e60b02b6. Population of work directory failed: Boot binding command failed: exit status: 1

Isolates your Pants from the elements.

Please select from the following boot commands:

<default> (when SCIE_BOOT is not set in the environment)  Detects the current Pants installation and launches it.
bootstrap-tools                                           Introspection tools for the Pants bootstrap process.
update                                                    Update scie-pants.

You can select a boot command by setting the SCIE_BOOT environment variable.

It's... not obvious to me at all that the right solution here is upgrading the scie-pants tool; I think we do need to do something here for Pants 2.24