Chore: Bump Microsoft.Graph from 5.105.0 to 6.8.0 - #149

'PostgreSqlBuilder.PostgreSqlBuilder()' is obsolete: 'This parameterless constructor is obsolete and will be removed. Use the constructor with the image parameter instead: https://github.com/testcontainers/testcontainers-dotnet/discussions/1470#discussioncomment-15185721.'

'PostgreSqlBuilder.PostgreSqlBuilder()' is obsolete: 'This parameterless constructor is obsolete and will be removed. Use the constructor with the image parameter instead: https://github.com/testcontainers/testcontainers-dotnet/discussions/1470#discussioncomment-15185721.'

'PostgreSqlBuilder.PostgreSqlBuilder()' is obsolete: 'This parameterless constructor is obsolete and will be removed. Use the constructor with the image parameter instead: https://github.com/testcontainers/testcontainers-dotnet/discussions/1470#discussioncomment-15185721.'

Possible null reference argument for parameter 'json' in 'JsonDocument JsonDocument.Parse(string json, JsonDocumentOptions options = default(JsonDocumentOptions))'.

Dereference of a possibly null reference.

'PostgreSqlBuilder.PostgreSqlBuilder()' is obsolete: 'This parameterless constructor is obsolete and will be removed. Use the constructor with the image parameter instead: https://github.com/testcontainers/testcontainers-dotnet/discussions/1470#discussioncomment-15185721.'

'PostgreSqlBuilder.PostgreSqlBuilder()' is obsolete: 'This parameterless constructor is obsolete and will be removed. Use the constructor with the image parameter instead: https://github.com/testcontainers/testcontainers-dotnet/discussions/1470#discussioncomment-15185721.'

'IEmailIngestionService' is obsolete: 'This service has been replaced by the hybrid IImapEmailService and IGraphEmailProcessor.'

'IEmailIngestionService' is obsolete: 'This service has been replaced by the hybrid IImapEmailService and IGraphEmailProcessor.'

'McpRequestFilterBuilderExtensions.AddSetLoggingLevelFilter(IMcpRequestFilterBuilder, McpRequestFilter<SetLevelRequestParams, EmptyResult>)' is obsolete: 'The Logging feature is deprecated as of specification version 2026-07-28 and may be removed in a future version. See SEP-2577 for more information.' (https://github.com/modelcontextprotocol/csharp-sdk/blob/main/docs/list-of-diagnostics.md#obsolete-apis)