fix: fixed toolchain caching

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 91.66667% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 90.24%. Comparing base (dbc932f) to head (94e1efe).

Files	Patch %	Lines
src/swiftorg.ts	78.94%	4 Missing :warning:
src/installer/base.ts	92.30%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #257 +/- ## ========================================== - Coverage 90.45% 90.24% -0.21% ========================================== Files 30 30 Lines 911 943 +32 Branches 126 133 +7 ========================================== + Hits 824 851 +27 - Misses 85 92 +7 + Partials 2 0 -2 ```

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