fix(core): fix slashes in inputs migrations

[FrozenPandaz]

Current Behavior

Paths during the inputs migration are written with the OS's path separators.

Expected Behavior

Paths during the inputs migration are written with /

Related Issue(s)

Fixes #

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🟥 Failed Commands
nx affected --target=e2e --base=bcbe59edba7f9450889bb9579e72e7da05bea1d9 --head=12dab1ce4092d11a1d6ea930e413eb76e24761fb --exclude=e2e-make-angular-cli-faster,e2e-detox,e2e-js,e2e-next,e2e-workspace-create,e2e-nx-run,e2e-nx-misc,e2e-react,e2e-web,e2e-angular-extensions,e2e-angular-core,e2e-nx-plugin,e2e-cypress,e2e-node,e2e-linter,e2e-jest,e2e-add-...

✅ Successfully ran 8 targets

• nx affected --target=lint --base=bcbe59edba7f9450889bb9579e72e7da05bea1d9 --head=12dab1ce4092d11a1d6ea930e413eb76e24761fb --parallel=3
• nx-cloud record -- yarn check-commit
• nx-cloud record -- yarn check-imports
• nx-cloud record -- yarn check-lock-files
• nx-cloud record -- yarn depcheck
• nx-cloud record -- yarn documentation
• nx-cloud record -- yarn nx format:check --base=bcbe59edba7f9450889bb9579e72e7da05bea1d9 --head=12dab1ce4092d11a1d6ea930e413eb76e24761fb
• nx-cloud record -- yarn nx workspace-lint

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