Update module cloud.google.com/go/functions to v1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cloud.google.com/go/functions	v0.2.0 -> v1.19.3

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.88%. Comparing base (2aa5e07) to head (c2e050c).
Report is 3 commits behind head on main.

❗ Current head c2e050c differs from pull request most recent head a778a78

Please upload reports for the commit a778a78 to get more accurate results.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #68   +/-   ##
=======================================
  Coverage   71.88%   71.88%           
=======================================
  Files          19       19           
  Lines         914      914           
=======================================
  Hits          657      657           
  Misses        198      198           
  Partials       59       59           

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