fix: always allow localhost to connect to dev server #5456
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For Bugs and Features; did you add new tests?
Yes
Motivation / Use-Case
The security changes in v5.2.1 broke webpack-dev-server for subdomains of localhost (e.g. http://myproject.localhost:8000). This PR fixes the changes and adds a test verifying that the behavior has changed.
Breaking Changes
N/A
Additional Info
I also tested this change by patching my project's copy of webpack-dev-server and it works as expected.