Build(deps): Bump excon from 0.80.1 to 0.81.0 (PR #12885)

Bumps excon from 0.80.1 to 0.81.0.


Sourced from excon's changelog.

0.81.0 2021-04-28

add helper for converting headers to strings add ssl_proxy_headers datum key and usage pass datum to socket tweak logging middleware to allow Syslog::logger usage remove ruby 3 from allowed failures


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