bump tcgc version to `0.45.3`

[ArcturusZhang]

Description

bump TCGC version to 0.45.3

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[live1206]

we should bump these as well? https://github.com/Azure/autorest.csharp/blob/6157a71466a6263cbff6e5a35e3a80d833b9fe26/package.json#L16 https://github.com/Azure/autorest.csharp/blob/6157a71466a6263cbff6e5a35e3a80d833b9fe26/src/TypeSpec.Extension/Emitter.Csharp/package.json#L56

[ArcturusZhang]

we should bump these as well?

https://github.com/Azure/autorest.csharp/blob/6157a71466a6263cbff6e5a35e3a80d833b9fe26/package.json#L16

https://github.com/Azure/autorest.csharp/blob/6157a71466a6263cbff6e5a35e3a80d833b9fe26/src/TypeSpec.Extension/Emitter.Csharp/package.json#L56

thank you for catching this. will fix.