remove test skips conditional on rlang package version

[simonpcouch]

Came up in review for #1131, which addressed some of these.

recipes requires rlang >= 1.0.3:

recipes/DESCRIPTION

Line 37 in 7627b8d

rlang (>= 1.0.3),

but several tests skip conditional on rlang version 1.0.0, e.g.

recipes/tests/testthat/test-sqrt.R

Line 57 in 7627b8d

skip_if(packageVersion("rlang") < "1.0.0")

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