fix(nginx): use rewrite instead of return for trailing slash redirect (#2226)

Changes the trailing slash redirect from using `return` with location
regex to using `rewrite` directive inside the location block. Also
removes quotes from the regex pattern to match the style of other regex
locations in the config.

This should fix the issue where the previous approach wasn't working.

Slack thread:
https://apify.slack.com/archives/C0L33UM7Z/p1770281199186039

https://claude.ai/code/session_01GqcrG6JU9Y1YaSA5ns87Yz

Co-authored-by: Claude <noreply@anthropic.com>

Author: B4nan

nginx.conf

@@ -36,8 +36,8 @@ server {
 
     # remove trailing slashes from all URLs (except root /)
     # exact match locations (e.g., location = /sdk/js/) take priority over this regex
-    location ~ "^(.+)/$" {
-        return 301 $1$is_args$args;
+    location ~ ^(.+)/$ {
+        rewrite ^(.+)/$ $1$is_args$args? redirect;
     }
 
     location / {