Update iOS and OSX versions for testing (#8023)

* update versions

* upd

* upd

* upd

* Update karma.conf.js

Author: Linchenn

e2e/karma.conf.js

@@ -182,7 +182,7 @@ module.exports = function(config) {
         browser: 'safari',
         browser_version: 'latest',
         os: 'OS X',
-        os_version: 'High Sierra'
+        os_version: 'Mojave'
       },
       bs_ios_12: {
         base: 'BrowserStack',

e2e/script_tag_tests/tfjs-core-cpu/karma.conf.js

@@ -95,13 +95,13 @@ module.exports = function(config) {
         browser: 'safari',
         browser_version: 'latest',
         os: 'OS X',
-        os_version: 'High Sierra'
+        os_version: 'Mojave'
       },
       bs_ios_12: {
         base: 'BrowserStack',
         device: 'iPhone X',
         os: 'iOS',
-        os_version: '11.0',
+        os_version: '12.3',
         real_mobile: true
       },
       bs_android_10: {

e2e/script_tag_tests/tfjs/karma.conf.js

@@ -87,13 +87,13 @@ module.exports = function(config) {
         browser: 'safari',
         browser_version: 'latest',
         os: 'OS X',
-        os_version: 'High Sierra'
+        os_version: 'Mojave'
       },
       bs_ios_12: {
         base: 'BrowserStack',
         device: 'iPhone X',
         os: 'iOS',
-        os_version: '11.0',
+        os_version: '12.3',
         real_mobile: true
       },
       bs_android_10: {

tools/karma_template.conf.js

@@ -53,7 +53,7 @@ const CUSTOM_LAUNCHERS = {
     browser: 'safari',
     browser_version: 'latest',
     os: 'OS X',
-    os_version: 'High Sierra'
+    os_version: 'Mojave'
   },
   bs_ios_12: {
     base: 'BrowserStack',
@@ -173,7 +173,8 @@ module.exports = function(config) {
       // This is necessary for non-flaky Safari tests. They usually pass just
       // fine without it, but sometimes, Safari will fail to connect to Karma.
       // If you want to remove this, prove that it's not flaky by running
-      // bazel test //tfjs-core/src:bs_safari_mac_from_pixels_worker_test --runs_per_test=100
+      // bazel test //tfjs-core/src:bs_safari_mac_from_pixels_worker_test
+      // --runs_per_test=100
       extraConfig.hostname = 'bs-local.com';
     }