Support older R versions

[Ellpeck]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 62.50000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 71.92%. Comparing base (f52a2e4) to head (64a0fa3).
Report is 2 commits behind head on main.

Files	Patch %	Lines
src/r-bridge/lang-4.x/ast/parser/json/format.ts	66.66%	1 Missing ⚠️
...4.x/ast/parser/xml/internal/loops/normalize-for.ts	0.00%	0 Missing and 1 partial ⚠️
...ng-4.x/ast/parser/xml/internal/normalize-access.ts	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #828      +/-   ##
==========================================
- Coverage   71.92%   71.92%   -0.01%     
==========================================
  Files         202      202              
  Lines        7296     7298       +2     
  Branches     1124     1124              
==========================================
+ Hits         5248     5249       +1     
- Misses       1694     1695       +1     
  Partials      354      354              

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[EagleoutIce]

This will now be handled in stages, the first PR adds the support for 3.6.x

[EagleoutIce]

This pull request is included in v2.0.5 (see Release v2.0.5 (Support for R 3.6.0)).