Bump AWSSDK.S3 from 3.7.400.1 to 4.0.102.5 - #102

Calling 'ArgumentNullException.ThrowIfNull' and passing a non-nullable value is a no-op (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca2264)

Possible null reference argument for parameter 'innerException' in 'DatabaseAccessException.DatabaseAccessException(string databasePath, Exception innerException)'.

'DateTime?' does not contain a definition for 'ToUniversalTime' and no accessible extension method 'ToUniversalTime' accepting a first argument of type 'DateTime?' could be found (are you missing a using directive or an assembly reference?)

The result of the expression is always 'true' since a value of type 'Guid' is never equal to 'null' of type 'Guid?'

Parameter 'value' must have a non-null value when exiting with 'true'.

Possible null reference argument for parameter 's' in 'byte[] Convert.FromBase64String(string s)'.

The type 'DockerSqliteBackup.Utilities.FileSystemUtilityJsonExtensions.FileSystemUtilityConfig' has been annotated with JsonSerializableAttribute but does not derive from JsonSerializerContext. No source code will be generated. (https://learn.microsoft.com/dotnet/fundamentals/syslib-diagnostics/syslib1224)

XML comment has badly formed XML -- 'Expected an end tag for element 'returns'.'

XML comment has badly formed XML -- 'Expected an end tag for element 'timestamp'.'

XML comment has badly formed XML -- 'End tag 'returns' does not match the start tag 'hex-hmac-sha256'.'

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-dotnet@v4, actions/upload-artifact@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/