Merge pull request grpc#21502 from gnossen/v1.26.x

Backport grpc#21487 to v1.26.x.

Merge pull request grpc#21358 from gnossen/bump_1_26_x_version

Bump 1.26.x version to 1.26.0-pre1

Merge pull request grpc#20948 from yashykt/v1.25.0-bump

Bump version to v1.25.0

Merge pull request grpc#20776 from yashykt/v1.25.x_update_to_pre1

Bump version to v1.25.0-pre1

Merge pull request grpc#20728 from veblush/v1.24-manylinux2010

Backport grpc#20616 grpc#20673

Merge pull request grpc#20535 from muxi/v1.24.x

Port grpc#20527: Fixed an issue where Swift application depending on gRPC is unable to archive

Merge pull request grpc#20458 from veblush/v1.24.1

Bump version to 1.24.1

Merge pull request grpc#20390 from veblush/v.1.23.1-bump

Bump version to v1.23.1

Merge pull request grpc#20348 from veblush/v1.24.0-bump

Bump version to 1.24.0

Merge pull request grpc#20257 from muxi/v1.24.x

Fix v1.24.0-pre1 objc release