Update test link to match updated devguide PR

Author: hugovk

templates/downloads/index.html

@@ -53,7 +53,7 @@ <h1 class="call-to-action">Download the latest version of Python</h1>
                     <h2 class="widget-title">Active Python releases</h2>
                     <p class="success-quote"><a href="https://devguide.python.org/versions/#versions">For more information visit the Python Developer's Guide</a>.</p>
 
-                    <p class="release-cycle-chart"><img src="https://hugovk-devguide.readthedocs.io/en/standalone-svg/release-cycle.svg" alt="Python release cycle"></p>
+                    <p class="release-cycle-chart"><img src="https://hugovk-devguide.readthedocs.io/en/standalone-svg/_static/release-cycle.svg" alt="Python release cycle"></p>
 
                     {% box 'downloads-active-releases' %}
                 </div>