chore: allow sys on local run

[WilliamBergamin]

Summary

Following the changes in slackapi/deno-slack-hooks#94

This PR allow locally run application to use the Deno.osRelease(); utility.

This should allow the use of the @slack/webapi library

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[filmaj]

Thanks for doing this! Let's hold off on merging this until we ROSI supports this and releases it first, though, otherwise we may give developers the false sense of security that using this system API is fine (while it's blocked for deployed apps).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.88%. Comparing base (ed8a6f6) to head (f749f04).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #67   +/-   ##
=======================================
  Coverage   94.87%   94.88%           
=======================================
  Files          14       14           
  Lines         527      528    +1     
  Branches       88       88           
=======================================
+ Hits          500      501    +1     
  Misses         27       27           

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