CI failures on `main` dev

[simonpcouch]

On ubuntu-latest (devel), seeing:

Run tensorflow::install_tensorflow(version='2.7', conda_python_version = NULL)
Error in .make_numeric_version(x, strict, .standard_regexps()$valid_numeric_version) : 
  invalid non-character version specification 'x' (type: double)
Calls: <Anonymous> ... as.numeric_version -> numeric_version -> .make_numeric_version
Execution halted
Error: Process completed with exit code 1.

[simonpcouch]

Addressed in #1071. :)

[github-actions]

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