chore(deps): update dependency proto-plus to v1.26.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
proto-plus	==1.25.0 -> ==1.26.0

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Release Notes

googleapis/proto-plus-python (proto-plus)

v1.26.0

Compare Source

Features

• Migrate to pyproject.toml (#​496) (82ed3b9)

Bug Fixes

• Construct messages with nested duration in protobuf 5.28+ (#​519) (197ddf8)
• Fix enums initialization in PyPy (#​507) (b8b68f2)
• Incorrect return type annotation for Message.to_dict (#​516) (72990f3)
• Use include rather than exclude to find_namespace_packages in setup.py (#​502) (77e252e)

Documentation

• Update docs link in README (#​524) (a85be75)

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