Update module github.com/bufbuild/buf to v1.28.1

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This PR contains the following updates:

Package	Type	Update	Change
github.com/bufbuild/buf	require	minor	v1.27.2 -> v1.28.1

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Release Notes

bufbuild/buf (github.com/bufbuild/buf)

v1.28.1

Compare Source

• The buf curl command has been updated to support the use of multiple schemas.
  This allows users to specify multiple --schema flags and/or to use both --schema
  and --reflect flags at the same time. The result is that additional sources can
  be consulted to resolve an element. This can be useful when the result of an RPC
  contains extensions or values in google.protobuf.Any messages that are not defined
  in the same schema that defines the RPC service.
• Fix issue where buf lint incorrectly reports error when (buf.validate.field).required
  is set for an optional field in proto3.

v1.28.0

Compare Source

• Add lint rules for protovalidate. buf lint
  will now verify that your protovalidate rules are valid. A single rule PROTOVALIDATE has been
  added to the DEFAULT group - given that protovalidate is net new, this does not represent
  a breaking change.
• Update buf beta price with the latest pricing information.
• Display a warning when reading a buf.lock with dependencies with b1 or b3 digests. b1 and b3
  digests will be deprecated in a future version. Run buf mod update to update dependency digests.

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