remove deprecated ast.Object

[oittaa]

While I was fixing other issues I noticed that ast.Object has been deprecated. https://pkg.go.dev/go/ast#Object

These are all the instances of its use I could find with grepping around.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 81.33803% with 53 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.66%. Comparing base (1216c9b) to head (0353890).
⚠️ Report is 154 commits behind head on master.

Files with missing lines	Patch %	Lines
rules/implicit_aliasing.go	0.00%	19 Missing ⚠️
rules/tls.go	87.50%	10 Missing and 6 partials ⚠️
rules/readfile.go	82.35%	5 Missing and 7 partials ⚠️
helpers.go	40.00%	1 Missing and 2 partials ⚠️
rules/archive.go	96.29%	1 Missing ⚠️
rules/decompression_bomb.go	94.73%	1 Missing ⚠️
rules/integer_overflow.go	94.44%	1 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1455      +/-   ##
==========================================
- Coverage   68.49%   65.66%   -2.84%     
==========================================
  Files          75       80       +5     
  Lines        4384     4945     +561     
==========================================
+ Hits         3003     3247     +244     
- Misses       1233     1545     +312     
- Partials      148      153       +5     

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