Update installer commit to fix SHA384 bug

Installer linked is affected by #7669

doc/faqs/how-to-install-composer-programmatically.md

@@ -35,7 +35,7 @@ give it uniqueness and authenticity as long as you can trust the GitHub servers.
 For example:
 
 ```bash
-wget https://raw.githubusercontent.com/composer/getcomposer.org/1b137f8bf6db3e79a38a5bc45324414a6b1f9df2/web/installer -O - -q | php -- --quiet
+wget https://raw.githubusercontent.com/composer/getcomposer.org/76a7060ccb93902cd7576b67264ad91c8a2700e2/web/installer -O - -q | php -- --quiet
 ```
 
 You may replace the commit hash by whatever the last commit hash is on