Version bump to v1.52.1 (grpc#32396)

Version bump to v1.51.2 (grpc#32392)

Version bump to v1.50.2 (grpc#32391)

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Version bump to v1.49.3 (grpc#32390)

Version bump to v1.48.4 (grpc#32389)

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Version bump to v1.47.4 (grpc#32388)

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Version bump to v1.46.7 (grpc#32387)

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Version bump to v1.45.3 (grpc#32386)

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Version bump to v1.44.1 (grpc#32375)

Bump version to 1.52.0 (on v1.52.x branch) (grpc#32187)

* bump version to 1.52.0

* regenerate projects