Handle OSSL 3.4 change to SAN:othername formatting

[bartonjs]

Fixes #111818

[Copilot]

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (1)

src/libraries/System.Security.Cryptography/tests/AsnEncodedDataTests.cs:121

• The error message string contains double colons '::' which seems to be a typo. It should be 'othername: UPN:subjectupn1@example.org'.

isOpenSsl3 ? "othername: UPN::subjectupn1@example.org" : "othername:<unsupported>",

[vcsjones]

For what it's worth, the commit / PR title mention SAN, but this is for UPN.

Okay never mind. It's the UPN in the SAN.

[vcsjones]

/backport to release/9.0-staging

[vcsjones]

/backport to release/8.0-staging

[github-actions]

Started backporting to release/9.0-staging: https://github.com/dotnet/runtime/actions/runs/14882206144

[github-actions]

Started backporting to release/8.0-staging: https://github.com/dotnet/runtime/actions/runs/14882209529

[vcsjones]

8.0 backport failed, but it didn't make a comment because the 9.0 re-locked the PR before 8.0 finished running.

I'll do 8.0 manually in a bit.