Don't mutate docs/Manifest.toml in CI

[tkf]

While writing #10, I noticed that docs/Manifest.toml was stale. But, the doc build has been working in the CI because it mutates docs/Manifest.toml via

https://github.com/simeonschaub/ArtifactUtils.jl/blob/6f67e4cc599ca4be8f5e6fc8d93b7d8e76b35d84/.github/workflows/ci.yml#L61

If we remove this line (as suggested in this PR), a stale docs/Manifest.toml would have caught in the CI: https://github.com/simeonschaub/ArtifactUtils.jl/runs/4516845588?check_suite_focus=true#step:5:8

Alternatively, we can also simply remove docs/Manifest.toml and keep Pkg.develop.

[codecov-commenter]

Codecov Report

Merging #11 (733424a) into main (6f67e4c) will not change coverage.
The diff coverage is n/a.

❗ Current head 733424a differs from pull request most recent head 7da6878. Consider uploading reports for the commit 7da6878 to get more accurate results

@@           Coverage Diff           @@
##             main      #11   +/-   ##
=======================================
  Coverage   49.17%   49.17%           
=======================================
  Files           3        3           
  Lines         181      181           
=======================================
  Hits           89       89           
  Misses         92       92           

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