Update pep503_whl_redirect to accomodate for rocm maj.min.patch version (#6071)

I am seeing validation error here:

https://github.com/pytorch/test-infra/actions/runs/12357596722/job/34504501590#step:14:2563
Executing:
```pip3 install --force-reinstall torch --index-url https://download.pytorch.org/whl/test/rocm6.2.4```
does not work, accessing https://download.pytorch.org/whl/test/6.2.4 does not work either

Author: atalman

aws/websites/download.pytorch.org/pep503_whl_redirect.js

@@ -3,14 +3,14 @@ function handler(event) {
     var uri = request.uri;
     var uri_parts = uri.split('/')
     var last_uri_part = uri_parts[uri_parts.length -1]
-    var rocm_pattern = /^rocm[0-9]+\.[0-9]+$/
+    var rocm_pattern = /^rocm[0-9]+(\.[0-9]+)*$/
 
     if (uri.startsWith('/whl')) {
         // Check whether the URI is missing a file name.
         if (uri.endsWith('/')) {
             request.uri += 'index.html';
         // Check whether the URI is folder like
-        // I.e. does not have dots in path or rocm\d.\d or 1.8 (for lts)
+        // I.e. does not have dots in path or rocm\d.\d or rocm\d.\d.\d or 1.8 (for lts)
         // For example /whl/cpu/torch
         } else if (last_uri_part.indexOf('.') == -1
                 || last_uri_part.match(rocm_pattern)