Bump Microsoft.Identity.Web from 2.21.1 to 3.4.0 in /webapi

Bumps [Microsoft.Identity.Web](https://github.com/AzureAD/microsoft-identity-web) from 2.21.1 to 3.4.0.
- [Release notes](https://github.com/AzureAD/microsoft-identity-web/releases)
- [Changelog](https://github.com/AzureAD/microsoft-identity-web/blob/master/changelog.md)
- [Commits](https://github.com/AzureAD/microsoft-identity-web/commits/3.4.0)

---
updated-dependencies:
- dependency-name: Microsoft.Identity.Web
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Directory.Packages.props

@@ -13,7 +13,7 @@
     <PackageVersion Include="Microsoft.Extensions.Configuration.Json" Version="8.0.1" />
     <PackageVersion Include="Microsoft.Extensions.Configuration.UserSecrets" Version="8.0.1" />
     <PackageVersion Include="Microsoft.Identity.Client" Version="4.66.2" />
-    <PackageVersion Include="Microsoft.Identity.Web" Version="2.21.1" />
+    <PackageVersion Include="Microsoft.Identity.Web" Version="3.4.0" />
     <PackageVersion Include="SharpToken" Version="2.0.3" />
     <PackageVersion Include="Swashbuckle.AspNetCore" Version="6.9.0" />
     <PackageVersion Include="System.CommandLine" Version="2.0.0-beta4.22272.1" />