fix(expect): allow expect.Matchers generic with single value

[mxschmitt]

Summary

Fixes #11985

This broke e.g. the Playwright project.

Test plan

Not sure how to provide tests for this.

[mrazauskas]

Thanks. Looks like a good idea.

Most probably I can help with the test. Will take a look a bit later.

See #11985 (comment)

[mxschmitt]

@mrazauskas thanks for the assistance <3

[codecov-commenter]

Codecov Report

Merging #11986 (8c0357a) into main (f41e128) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main   #11986   +/-   ##
=======================================
  Coverage   68.74%   68.74%           
=======================================
  Files         323      323           
  Lines       16649    16649           
  Branches     4808     4808           
=======================================
  Hits        11445    11445           
  Misses       5171     5171           
  Partials       33       33           

Impacted Files	Coverage Δ
packages/expect/src/index.ts	91.78% <ø> (ø)

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[SimenB]

thanks!

[github-actions]

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