Update module github.com/bufbuild/buf to v1.26.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/bufbuild/buf	require	minor	v1.24.0 -> v1.26.1

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Release Notes

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

v1.26.1

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• Fix issue where buf build -o did not properly output files with the .txtpb
  extension in Protobuf text format.

v1.26.0

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• Add support for the --http2-prior-knowledge flag when running buf curl
  against secure "https" URLs. This can be used with gRPC servers, that only
  support HTTP/2, when used with a network (layer 4) load balancer, that does
  not support protocol negotiation in TLS handshake.

v1.25.1

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• Fix issue where all files were being iterated over when using the --path flag.
• Fix issue where the directory . was incorrectly accepted as a value for the
  directories key in buf.work.yaml.

v1.25.0

Compare Source

• Add txtpb format to handle the Protobuf text format. and automatically recognize
  .txtpb files as Protobuf text files. The txtpb format can now be used with
  all buf commands that take images as input or output, such as build, convert,
  and curl.

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