Update ocert.org URLs from HTTP to HTTPS in docs

The ocert.org site supports HTTPS. Update the two references in
datamodel.rst and cmdline.rst to use HTTPS for better security.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Anandesh-Sharma

Doc/reference/datamodel.rst

@@ -2256,7 +2256,7 @@ Basic customization
       This is intended to provide protection against a denial-of-service caused
       by carefully chosen inputs that exploit the worst case performance of a
       dict insertion, *O*\ (*n*\ :sup:`2`) complexity.  See
-      http://ocert.org/advisories/ocert-2011-003.html for details.
+      https://ocert.org/advisories/ocert-2011-003.html for details.
 
       Changing hash values affects the iteration order of sets.
       Python has never made guarantees about this ordering

Doc/using/cmdline.rst

@@ -390,7 +390,7 @@ Miscellaneous options
    Hash randomization is intended to provide protection against a
    denial-of-service caused by carefully chosen inputs that exploit the worst
    case performance of a dict construction, *O*\ (*n*\ :sup:`2`) complexity.  See
-   http://ocert.org/advisories/ocert-2011-003.html for details.
+   https://ocert.org/advisories/ocert-2011-003.html for details.
 
    :envvar:`PYTHONHASHSEED` allows you to set a fixed value for the hash
    seed secret.