Fix amd64 darwin install wrong tool (amd64)

[umbynos]

Please check if the PR fulfills these requirements

• The PR has no duplicates (please search among the Pull Requests
  before creating one)
• Tests for the changes have been added (for bug fixes / features)

• What kind of change does this PR introduce?

Fix #751

• What is the current behavior?

See #751

• What is the new behavior?

The agent should be able to select the correct tool system to download

• Does this PR introduce a breaking change?

no

• Other information:

[umbynos]

See the failing tests:

=== RUN   TestDownloadCorrectPlatform/darwinamd64
    download_test.go:62: 
        	Error Trace:	/home/runner/work/arduino-create-agent/arduino-create-agent/tools/download_test.go:62
        	Error:      	Not equal: 
        	            	expected: "arm64-apple-darwin"
        	            	actual  : "x86_64-apple-darwin"
        	            	
        	            	Diff:
        	            	--- Expected
        	            	+++ Actual
        	            	@@ -1 +1 @@
        	            	-arm64-apple-darwin
        	            	+x86_64-apple-darwin
        	Test:       	TestDownloadCorrectPlatform/darwinamd64

[codecov-commenter]

Codecov Report

Base: 11.05% // Head: 11.57% // Increases project coverage by +0.51% 🎉

Coverage data is based on head (20f8d55) compared to base (58d2960).
Patch coverage: 33.33% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #753      +/-   ##
==========================================
+ Coverage   11.05%   11.57%   +0.51%     
==========================================
  Files          50       50              
  Lines        3853     3853              
==========================================
+ Hits          426      446      +20     
+ Misses       3373     3352      -21     
- Partials       54       55       +1     

Flag	Coverage Δ
unit	11.57% <33.33%> (+0.51%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
tools/download.go	30.62% <33.33%> (+4.78%)	⬆️

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[umbynos]

PS I reverted the bump for www.github.com/xrash/smetrics (done in #746), because the old version of the algorithm was giving different similarity and the problem was not happening...
Yeah this library needs replacing for sure...