Update reference for code scanning autofix to use 5.3-codex (#60741)

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Sarita Iyer <66540150+saritai@users.noreply.github.com>

Author: 3 people

content/code-security/concepts/code-scanning/copilot-autofix-for-code-scanning.md

@@ -15,7 +15,7 @@ category:
 
 ## How {% data variables.copilot.copilot_autofix_short %} works
 
-{% data variables.copilot.copilot_autofix_short %} translates the description and location of an alert into code changes that may fix the alert. It interfaces with the large language model {% data variables.copilot.copilot_gpt_51 %} from OpenAI, which has sufficient generative capabilities to produce both suggested fixes in code and explanatory text for those fixes.
+{% data variables.copilot.copilot_autofix_short %} translates the description and location of an alert into code changes that may fix the alert. It interfaces with the large language model {% data variables.copilot.copilot_gpt_53_codex %} from OpenAI, which has sufficient generative capabilities to produce both suggested fixes in code and explanatory text for those fixes.
 
 ## Enabling and managing {% data variables.copilot.copilot_autofix_short %}
 

content/code-security/responsible-use/responsible-use-autofix-code-scanning.md

@@ -20,7 +20,7 @@ category:
 
 {% data reusables.rai.code-scanning.copilot-autofix-note %}
 
-{% data variables.copilot.copilot_autofix_short %} generates potential fixes that are relevant to the existing source code and translates the description and location of an alert into code changes that may fix the alert. {% data variables.copilot.copilot_autofix_short %} uses internal {% data variables.product.prodname_copilot %} APIs interfacing with the large language model {% data variables.copilot.copilot_gpt_51 %} from OpenAI, which has sufficient generative capabilities to produce both suggested fixes in code and explanatory text for those fixes.
+{% data variables.copilot.copilot_autofix_short %} generates potential fixes that are relevant to the existing source code and translates the description and location of an alert into code changes that may fix the alert. {% data variables.copilot.copilot_autofix_short %} uses internal {% data variables.product.prodname_copilot %} APIs interfacing with the large language model {% data variables.copilot.copilot_gpt_53_codex %} from OpenAI, which has sufficient generative capabilities to produce both suggested fixes in code and explanatory text for those fixes.
 
 {% data variables.copilot.copilot_autofix_short %} is allowed by default and enabled for every repository using {% data variables.product.prodname_codeql %}, but you can choose to opt out and disable {% data variables.copilot.copilot_autofix_short %}. To learn how to disable {% data variables.copilot.copilot_autofix_short %} at the enterprise, organization and repository levels, see [AUTOTITLE](/code-security/code-scanning/managing-code-scanning-alerts/disabling-autofix-for-code-scanning).