Update Microsoft.IdentityModel to 8.12.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
Microsoft.IdentityModel.JsonWebTokens	8.12.0 -> 8.12.1
Microsoft.IdentityModel.Protocols.OpenIdConnect	8.12.0 -> 8.12.1
Microsoft.IdentityModel.Tokens	8.12.0 -> 8.12.1

---

Release Notes

AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet (Microsoft.IdentityModel.JsonWebTokens)

v8.12.1

Compare Source

====

Fundamentals

• Update .NET SDK version to 9.0.107 used when building or running the code. See #​3385 for details.
• To keep our experimental code separate from production code, all files associated with experimental features have been moved to the Experimental folders. See PR #​3261 for details.
• Experimental code leaked into TokenValidationResult from early prototypes. See PR #​3259 for details.

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about these updates again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.