fix unit tests · fsprojects/FSharp.MongoDB@e2683cd

ubuntu-latest pipelines will use ubuntu-24.04 soon. For more details, see https://github.com/actions/runner-images/issues/10636

Build & Test: src/FSharp.MongoDB.Bson/Serialization/FSharpTypeHelpers.fs#L39

Nullness warning: The type 'System.Type' does not support 'null'.

Build & Test: src/FSharp.MongoDB.Bson/Serialization/FSharpTypeHelpers.fs#L47

Nullness warning: The type 'System.Type' does not support 'null'.

Build & Test: src/FSharp.MongoDB.Bson/Serialization/FSharpValueSerializer.fs#L43

Nullness warning: The type 'IBsonSerializer' does not support 'null'.

Build & Test: tests/FSharp.MongoDB.Bson.Tests/FSharpListSerializationTests.fs#L90

Nullness warning: The type 'string' does not support 'null'.

Build & Test: tests/FSharp.MongoDB.Bson.Tests/FSharpListSerializationTests.fs#L96

Nullness warning: The type 'string' does not support 'null'.

Build & Test: tests/FSharp.MongoDB.Bson.Tests/FSharpSetSerializationTests.fs#L90

Nullness warning: The type 'string' does not support 'null'.

Build & Test: tests/FSharp.MongoDB.Bson.Tests/FSharpSetSerializationTests.fs#L96

Nullness warning: The type 'string' does not support 'null'.

Build & Test: tests/FSharp.MongoDB.Bson.Tests/FSharpUnionSerializationTests.fs#L318

Main module of program is empty: nothing will happen when it is run

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