Bump windows-sys to 0.48.0

[KapJI]

Updated version of https://github.com/steffengy/schannel-rs/pull/89.

Release notes: https://github.com/microsoft/windows-rs/releases/tag/0.48.0

• CRYPTOAPI_BLOB renamed to CRYPT_INTEGER_BLOB: https://github.com/microsoft/win32metadata/commit/a35703057a1b2a8813154eca0acf1f4e5134a990
• windows-sys-0.43 changed encoding for all string constants: https://github.com/microsoft/windows-rs/pull/2101
• null_terminate! removed as it's no longer needed.
• Use non-wide UNISP_NAME_A.
• All tests pass locally (with SCHANNEL_RS_SKIP_SERVER_TESTS=1 as I don't want to install new certs on my machine).

[KapJI]

Looks like Appveyor has issues with TLS now and it's unable to download rust installer or crates.

I'd be glad if you help me with this or just check it locally to make sure all tests pass.

[KapJI]

By the way, maybe you want to migrate to Github Actions?

It's usually more reliable and has Windows Server 2022 and 2019 images. I can submit a PR for that if you want to.

[steffengy]

@KapJI yeah fine with migrating there vs spending time to fix it until the next appveyor thing breaks the next thing.

[steffengy]

@KapJI should be done.

[KapJI]

I rebased this PR but GH checks need approval. That's quite annoying and I usually change this setting to only require approval from new github users in my repos. This can be done in repo settings:

Also looks like Appveyor needs to be disabled in Settings->Webhooks. Because now it fallbacks to default config.

[steffengy]

@KapJI Changed setting, appveyor is fully removed already but that preexisting last build check sticks around.

[steffengy]

Released as v0.1.22

[djc]

Thanks @KapJI and @steffengy for getting this done!