Bump Swashbuckle.AspNetCore from 8.1.2 to 8.1.4 (#3698)

---
updated-dependencies:
- dependency-name: Swashbuckle.AspNetCore
  dependency-version: 8.1.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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docs/extensibility/snippets/MailDevResourceWithCredentials/MailDevResource.NewsletterService/MailDevResource.NewsletterService.csproj

@@ -2,7 +2,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="9.0.5" />
-    <PackageReference Include="Swashbuckle.AspNetCore" Version="8.1.2" />
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="8.1.4" />
   </ItemGroup>
 
   <ItemGroup>