Support older R versions

[codecov[bot]]

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 :warning:
...4.x/ast/parser/xml/internal/loops/normalize-for.ts	0.00%	0 Missing and 1 partial :warning:
...ng-4.x/ast/parser/xml/internal/normalize-access.ts	0.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ 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)).