Downgrade go version to 1.20

[VenelinMartinov]

We have inadvertently picked up go 1.21, when the bridge still needs 1.20

The dependency came from go-snaps, so I've downgraded that to the latest version which doesn't need 1.21

[codecov]

Codecov Report

Attention: 83 lines in your changes are missing coverage. Please review.

Comparison is base (8c45fd2) 33.45% compared to head (77cea43) 36.80%.
Report is 4 commits behind head on main.

Files	Patch %	Lines
providers/providerMock.go	49.05%	53 Missing and 1 partial ⚠️
replay/replay.go	67.56%	20 Missing and 4 partials ⚠️
pulumitest/assertrefresh/asserts.go	66.66%	2 Missing and 1 partial ⚠️
pulumitest/pulumiTest.go	88.23%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #62      +/-   ##
==========================================
+ Coverage   33.45%   36.80%   +3.35%     
==========================================
  Files          42       42              
  Lines        2571     2630      +59     
==========================================
+ Hits          860      968     +108     
+ Misses       1606     1559      -47     
+ Partials      105      103       -2     

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