chore: use alternate .tool-versions filename for tests

[jdx]

this way it wont conflict

[codecov]

Codecov Report

Base: 81.39% // Head: 82.09% // Increases project coverage by +0.69% 🎉

Coverage data is based on head (9ca1f26) compared to base (7f68e71).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #172      +/-   ##
==========================================
+ Coverage   81.39%   82.09%   +0.69%     
==========================================
  Files          90       90              
  Lines        2860     2860              
==========================================
+ Hits         2328     2348      +20     
+ Misses        532      512      -20     

Impacted Files	Coverage Δ
src/cli/global.rs	100.00% <ø> (ø)
src/cli/local.rs	76.92% <ø> (ø)
src/config/config_file/mod.rs	89.58% <ø> (ø)
src/config/config_file/tool_versions.rs	94.80% <ø> (ø)
src/file.rs	92.30% <ø> (ø)
src/hook_env.rs	72.54% <ø> (ø)
src/toolset/tool_source.rs	83.33% <ø> (ø)
src/env.rs	73.26% <100.00%> (ø)
src/plugins/mod.rs	87.75% <0.00%> (+1.02%)	⬆️
src/cli/current.rs	82.35% <0.00%> (+5.88%)	⬆️
... and 2 more

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