fix(nextjs): use posix path format for generated config.distdir

[lourd]

ISSUES CLOSED: #8989. See that for context.

Related Issue(s)

Fixes #8989

I've tested this on Windows, confirming that both building and deploying on Windows still works as expected, as well as building on Windows and deploying on Linux, which did not work before.

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✅ Successfully ran 6 targets

• nx affected --target=e2e --base=96be786dcc05be785a59b083b1608cc6203ef28e --head=f44b0bf4d9e209fb8f0fd85fff69b459cd0138d1 --exclude=e2e-react-native,e2e-detox --parallel=1
• nx run-many --target=build --all --parallel=8
• nx affected --target=test --base=96be786dcc05be785a59b083b1608cc6203ef28e --head=f44b0bf4d9e209fb8f0fd85fff69b459cd0138d1 --parallel=1
• nx affected --target=build --base=96be786dcc05be785a59b083b1608cc6203ef28e --head=f44b0bf4d9e209fb8f0fd85fff69b459cd0138d1 --parallel=3
• nx affected --target=lint --base=96be786dcc05be785a59b083b1608cc6203ef28e --head=f44b0bf4d9e209fb8f0fd85fff69b459cd0138d1 --parallel=3
• nx build typedoc-theme

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[lourd]

Please let me know if there's anything I can do to help push this along!

[lourd]

@kirjai — let me know if there's something else I need to do to get this looked at. Sorry to tag you individually, just saw your name on a lot of past Next.js PRs.

[kirjai]

hey @lourd , thanks a lot for both the detailed issue, as well as the PR, really appreciated!

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