Fix CI (#3229)

* check if SAUCE_USERNAME and SAUCE_ACCESS_KEY are correctly defined

* temporarily bring back .sauce.yml

* update saucelabs

Author: HackbrettXXX

.sauce.yml

@@ -0,0 +1,4 @@
+addons:
+  sauce_connect:
+    username: jspdf
+    access_key: 522494eb-e777-4583-87c5-616a74cbf64d

package-lock.json

@@ -26,7 +26,13 @@ const browsers = {
 
 module.exports = config => {
   // Use ENV vars or .sauce.yml to get credentials
-  if (!process.env.SAUCE_USERNAME) {
+  if (
+    !(
+      process.env.SAUCE_USERNAME &&
+      process.env.SAUCE_ACCESS_KEY &&
+      process.env.SAUCE_ACCESS_KEY.length > 5
+    )
+  ) {
     if (!fs.existsSync(".sauce.yml")) {
       // eslint-disable-next-line no-console
       console.log("Create a .sauce.yml with your credentials");