Update dependency base62 to v2 (#7077)

package.json

@@ -203,7 +203,7 @@
   "homepage": "https://github.com/mozilla/addons-frontend#readme",
   "dependencies": {
     "@babel/polyfill": "7.0.0",
-    "base62": "1.2.8",
+    "base62": "2.0.0",
     "base64url": "3.0.1",
     "better-npm-run": "0.1.1",
     "chokidar": "2.0.4",

src/amo/components/App/index.js

@@ -150,8 +150,8 @@ export class AppBase extends React.Component<Props> {
       );
       return;
     }
-    // If the encoded timestamp was malformed it will be 0 or negative.
-    if (createdAt <= 0) {
+    // If the encoded timestamp was malformed it will be NaN, 0 or negative.
+    if (Number.isNaN(createdAt) || createdAt <= 0) {
       log.error(oneLine`Got an invalid timestamp from auth token;
         encoded value: ${encodedTimestamp}; decoded value: ${createdAt}`);
       return;

yarn.lock

@@ -3363,10 +3363,10 @@ balanced-match@^1.0.0:
   resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"
   integrity sha1-ibTRmasr7kneFk6gK4nORi1xt2c=
 
-base62@1.2.8:
-  version "1.2.8"
-  resolved "https://registry.yarnpkg.com/base62/-/base62-1.2.8.tgz#1264cb0fb848d875792877479dbe8bae6bae3428"
-  integrity sha512-V6YHUbjLxN1ymqNLb1DPHoU1CpfdL7d2YTIp5W3U4hhoG4hhxNmsFDs66M9EXxBiSEke5Bt5dwdfMwwZF70iLA==
+base62@2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/base62/-/base62-2.0.0.tgz#62292693fb0418824caaae6dc19d01fe8bdd9691"
+  integrity sha512-s3DXUcvJVW9vd9L/iahft3cxsrBQsXfG0ktX/uzkKOO7ZHHE8Lw3mP+rSXb7YzVavX+fB1jX1GFHDfI/NX8/SQ==
 
 base64-js@^1.0.2:
   version "1.3.0"