Handle API change in is_manifest_current in Julia 1.11

[jkrumbiegel]

Fixes #10225

As CI here doesn't have the ability to test multiple Julia versions, we can't have a test for this. I just checked that the error didn't appear locally with and without QUARTO_JULIA=/Users/krumbiegel/.julia/juliaup/julia-1.11.0-rc1+0.aarch64.apple.darwin14/bin/julia.

[cscheid]

Thank you!

[devmotion]

I just noticed in an old project that still uses Julia 1.7 that Pkg.is_manifest_current is only available in Julia >= 1.8 and hence the julia engine can't be used on Julia < 1.8 currently, even though QuartoNotebookRunner supports Julia >= 1.6. Probably less of an issue now that Julia 1.10 is the LTS version but maybe this should be documented somewhere and a clear error message should be thrown when a user happens to run a Julia version that is too old?