Bump Microsoft.AspNetCore.OpenApi from 8.0.20 to 8.0.21

[dependabot[bot]]

Updated Microsoft.AspNetCore.OpenApi from 8.0.20 to 8.0.21.

Release notes

Sourced from Microsoft.AspNetCore.OpenApi's releases.

8.0.21

Release

What's Changed

• Update branding to 8.0.21 by @​vseanreesermsft in https://github.com/dotnet/aspnetcore/pull/63509
• [release/8.0] (deps): Bump src/submodules/googletest from 373af2e to eb2d85e by @​dependabot[bot] in https://github.com/dotnet/aspnetcore/pull/63500
• [release/8.0] Make duplicate deb/rpm packages so we can sign them with the new PMC key by @​github-actions[bot] in https://github.com/dotnet/aspnetcore/pull/63250
• [release/8.0] Extend Unofficial 1ES template in IdentityModel nightly tests job by @​github-actions[bot] in https://github.com/dotnet/aspnetcore/pull/63466
• [release/8.0] Quarantine ResponseBody_WriteContentLength_PassedThrough by @​github-actions[bot] in https://github.com/dotnet/aspnetcore/pull/63534
• [release/8.0] Update dependencies from dotnet/source-build-reference-packages by @​dotnet-maestro[bot] in https://github.com/dotnet/aspnetcore/pull/63261
• [release/8.0] Use wait assert in flaky tests by @​ilonatommy in https://github.com/dotnet/aspnetcore/pull/63565
• [release/8.0] Update Microsoft.Build versions by @​github-actions[bot] in https://github.com/dotnet/aspnetcore/pull/62507
• Merging internal commits for release/8.0 by @​vseanreesermsft in https://github.com/dotnet/aspnetcore/pull/63603
• backport(8.0): Fix runtime architecture detection logic in ANCM by @​DeagleGross in https://github.com/dotnet/aspnetcore/pull/63706

Full Changelog: https://github.com/dotnet/aspnetcore/compare/v8.0.20...v8.0.21

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