Update dependency automattic/jetpack-constants to v1.6.4

composer.json

@@ -15,7 +15,7 @@
   "require": {
     "php": ">=7.0",
     "automattic/jetpack-autoloader": "2.10.1",
-    "automattic/jetpack-constants": "1.5.1",
+    "automattic/jetpack-constants": "1.6.4",
     "composer/installers": "~1.7",
     "maxmind-db/reader": "1.6.0",
     "pelago/emogrifier": "3.1.0",

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "be33d948ed1d2ee3a7a23ef657f3148d",
+    "content-hash": "7106f7f9a173c8f89c66c52a8d724ecb",
     "packages": [
         {
             "name": "automattic/jetpack-autoloader",
@@ -55,23 +55,34 @@
         },
         {
             "name": "automattic/jetpack-constants",
-            "version": "v1.5.1",
+            "version": "v1.6.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/Automattic/jetpack-constants.git",
-                "reference": "18f772daddc8be5df76c9f4a92e017a3c2569a5b"
+                "reference": "cebd2c4760636595c7024e9381d5ee5a79825dbc"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/Automattic/jetpack-constants/zipball/18f772daddc8be5df76c9f4a92e017a3c2569a5b",
-                "reference": "18f772daddc8be5df76c9f4a92e017a3c2569a5b",
+                "url": "https://api.github.com/repos/Automattic/jetpack-constants/zipball/cebd2c4760636595c7024e9381d5ee5a79825dbc",
+                "reference": "cebd2c4760636595c7024e9381d5ee5a79825dbc",
                 "shasum": ""
             },
             "require-dev": {
-                "php-mock/php-mock": "^2.1",
-                "phpunit/phpunit": "^5.7 || ^6.5 || ^7.5"
+                "automattic/jetpack-changelogger": "^1.1",
+                "brain/monkey": "2.6.0",
+                "yoast/phpunit-polyfills": "0.2.0"
             },
             "type": "library",
+            "extra": {
+                "autotagger": true,
+                "mirror-repo": "Automattic/jetpack-constants",
+                "changelogger": {
+                    "link-template": "https://github.com/Automattic/jetpack-constants/compare/v${old}...v${new}"
+                },
+                "branch-alias": {
+                    "dev-master": "1.6.x-dev"
+                }
+            },
             "autoload": {
                 "classmap": [
                     "src/"
@@ -82,7 +93,7 @@
                 "GPL-2.0-or-later"
             ],
             "description": "A wrapper for defining constants in a more testable way.",
-            "time": "2020-10-28T19:00:31+00:00"
+            "time": "2021-04-08T13:56:29+00:00"
         },
         {
             "name": "composer/installers",