chore(deps): update upm project dependency com.unity.transport to v2.7.3 (develop)

[unity-renovate]

This PR contains the following updates:

Package	Type	Update	Editor	Change
com.unity.transport	dependencies	patch	✅ Compatible	2.7.2 -> 2.7.3

✅ Editor bump: Not required for testproject-tools-integration/Packages/manifest.json

This is probably safe to merge for this project

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Release Notes

com.unity.transport (com.unity.transport)

v2.7.3

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Fixes

• Avoid dereferencing a null pointer/reference when calling NetworkDriver.GetPipelineBuffers for an invalid pipeline/stage combination (e.g getting the buffers of a pipeline stage not part of the provided pipeline). The returned buffers will just be set to default instead.

v2.7.2

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Fixes

• Make sure SecureNetworkProtocolParameter can be serialized properly by making FixedPEMString serializable.
• Ignore SIGPIPE on Linux IL2CPP server builds. This could result in a crash when using WebSockets and a client would unexpectedly close its connection. Note that the signal is ignored for the whole process group. This shouldn't cause any issues (Mono ignores the signal by default for instance) but if your application somehow needs to be able to handle SIGPIPE, you can set the UNITY_TRANSPORT_DONT_IGNORE_SIGPIPE define for your project to prevent the transport package from ignoring it.

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Configuration

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