No bug: [tryselect] Use up-to-date URL for code-coverage information;…

… r=ahal

Differential Revision: https://phabricator.services.mozilla.com/D61645

--HG--
extra : moz-landing-system : lando

tools/tryselect/selectors/coverage.py

@@ -122,7 +122,7 @@ def download_coverage_mapping(base_revision):
     except (IOError, ValueError):
         print('Chunk mapping file not found.')
 
-    CHUNK_MAPPING_URL_TEMPLATE = 'https://index.taskcluster.net/v1/task/project.releng.services.project.production.code_coverage_bot.{}/artifacts/public/chunk_mapping.tar.xz'  # noqa
+    CHUNK_MAPPING_URL_TEMPLATE = 'https://firefox-ci-tc.services.mozilla.com/api/index/v1/task/project.releng.services.project.production.code_coverage_bot.{}/artifacts/public/chunk_mapping.tar.xz'  # noqa
     JSON_PUSHES_URL_TEMPLATE = 'https://hg.mozilla.org/mozilla-central/json-pushes?version=2&tipsonly=1&startdate={}'  # noqa
 
     # Get pushes from at most one month ago.