fix: bump proton commit version

[sudo-suhas]

Proto generation was failing due to invalid commit SHA:

$ make proto
 > generating protobuf from goto/proton
 > [info] make sure correct version of dependencies are installed using 'make install'
Failure: got HTTP status code 404
make: *** [proto] Error 1

Bump proton commit version to latest and regenerate proto files and docs.

[coveralls]

Pull Request Test Coverage Report for Build 4424824811

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 86.142%

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Totals
Change from base Build 4413867333:	0.0%
Covered Lines:	5010
Relevant Lines:	5816

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💛 - Coveralls