fix: use less strict validation for external URLs (#1104)

* fix: use less strict validation for external URLs

Default url validation from the Yup module doesn't allow URLs like "http://custom-host", while it is
a correct value for an external URL.

fix #1068

* fix: resolve GitHub CodeQL review

src/components/Settings/SettingsPlex.tsx

@@ -190,7 +190,10 @@ const SettingsPlex = ({ onComplete }: SettingsPlexProps) => {
         otherwise: Yup.string().nullable(),
       }),
       tautulliExternalUrl: Yup.string()
-        .url(intl.formatMessage(messages.validationUrl))
+        .matches(
+          /^https?:\/\/(www\.)?[-a-zA-Z0-9@:%._+~#=]{1,256}(\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_+.~#?&/=]*))?$/i,
+          intl.formatMessage(messages.validationUrl)
+        )
         .test(
           'no-trailing-slash',
           intl.formatMessage(messages.validationUrlTrailingSlash),