be mindful of case sensitivity in project outputs (was: Website with LICENSE.md and license.qmd fails to render)

Bug description

I have a website project with a LICENSE.md file and a license.qmd file. The idea was that LICENSE.md is for folks perusing the repo (and used to seeing that file in GitHub repos) and license.qmd can be a page on my actual website. I'm fairly certain this wasn't a problem a couple of months ago when I first put this project together, but today with 1.4.366 it fails to render with the error:

ERROR: NotFound: No such file or directory (os error 2): rename '/Users/mine/Desktop/test-website-license/LICENSE.html' -> '/Users/mine/Desktop/test-website-license/_site/LICENSE.html'

Stack trace:
    at Object.renameSync (ext:deno_fs/30_fs.js:215:7)
    at renderProject (file:///Applications/quarto/bin/quarto.js:76830:22)
    at eventLoopTick (ext:core/01_core.js:181:11)
    at async serveProject (file:///Applications/quarto/bin/quarto.js:95892:24)
    at async Command.fn (file:///Applications/quarto/bin/quarto.js:96481:9)
    at async Command.execute (file:///Applications/quarto/bin/quarto.js:8111:13)
    at async quarto (file:///Applications/quarto/bin/quarto.js:111446:5)
    at async file:///Applications/quarto/bin/quarto.js:111464:9

And this happens whether license.qmd is listed in _quarto.yml or not.

Steps to reproduce

Clone https://github.com/mine-cetinkaya-rundel/test-website-license and render it.

Expected behavior

No response

Actual behavior

No response

Your environment

• RStudio: Version 2023.06.2+561 (2023.06.2+561)
• OS: MacOS Ventura 13.5 (22G74)

Quarto check output

Quarto 1.4.366
[✓] Checking versions of quarto binary dependencies...
      Pandoc version 3.1.8: OK
      Dart Sass version 1.55.0: OK
      Deno version 1.33.4: OK
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
      Version: 1.4.366
      Path: /Applications/quarto/bin

[✓] Checking tools....................OK
      TinyTeX: v2023.08
      Chromium: (not installed)

[✓] Checking LaTeX....................OK
      Using: TinyTex
      Path: /Users/mine/Library/TinyTeX/bin/universal-darwin
      Version: 2023

[✓] Checking basic markdown render....OK

[✓] Checking Python 3 installation....OK
      Version: 3.9.6
      Path: /Library/Developer/CommandLineTools/usr/bin/python3
      Jupyter: 5.3.0
      Kernels: python3

[✓] Checking Jupyter engine render....OK

[✓] Checking R installation...........OK
      Version: 4.3.1
      Path: /Library/Frameworks/R.framework/Resources
      LibPaths:
        - /Library/Frameworks/R.framework/Versions/4.3-arm64/Resources/library
      knitr: 1.43
      rmarkdown: 2.24

[✓] Checking Knitr engine render......OK