We accidently removed RFC3987 validation from route paths (#4415)

* We accidently removed RFC3987 validation from route paths

Signed-off-by: Tyler Ball <tyler.ball@konghq.com>

* Update app/gateway/changelog.md

Co-authored-by: Datong Sun <datong.sun@konghq.com>

Signed-off-by: Tyler Ball <tyler.ball@konghq.com>
Co-authored-by: Angel <Guaris@users.noreply.github.com>
Co-authored-by: Datong Sun <datong.sun@konghq.com>

app/gateway/changelog.md

@@ -769,6 +769,9 @@ openid-connect
   recommended to upgrade yet if you are an OpenTracing user. This will be
   rectified in an upcoming patch/minor release.
 
+* RFC3987 validation on route paths was removed, allowing operators to create a route with an invalid path
+  URI like `/something|` which can not match any incoming request. This validation will be added back in a future release.
+
 ### Dependencies
 
 * Bumped `openresty` from 1.19.9.1 to 1.21.4.1