fix: try/catch all cache attempts

lib/platform/github/gh-got-wrapper.js

@@ -75,6 +75,7 @@ async function get(path, options, retries = 5) {
         res.body = res.body.concat(
           ...pages.filter(Boolean).map(page => page.body)
         );
+        try {
           const cacheMinutes = 60 * 24;
           await renovateCache.set(
             cacheNamespace,
@@ -82,6 +83,9 @@ async function get(path, options, retries = 5) {
             { etag, body: res.body },
             cacheMinutes
           );
+        } catch (err) /* istanbul ignore next */ {
+          logger.warn('Error setting renovateCache value');
+        }
       }
     }
     if (