chore: Update dependencies.

Signed-off-by: Rubén D <nuxsmin@syspass.org>

composer.json

@@ -19,14 +19,14 @@
   },
   "require": {
     "roave/security-advisories": "dev-master",
-    "php": "~7.3 || ~7.4",
-    "defuse/php-encryption": "~2.1",
-    "phpmailer/phpmailer": "~6.0",
+    "php": "~7.4",
+    "defuse/php-encryption": "^2.1",
+    "phpmailer/phpmailer": "^6.0",
     "ademarre/binary-to-text-php": "dev-master",
-    "phpseclib/phpseclib": "~2.0.25",
-    "klein/klein": "~2.1.2",
-    "php-di/php-di": "~6.0.11",
-    "doctrine/common": "~v2.7.3",
+    "phpseclib/phpseclib": "^2.0",
+    "klein/klein": "^2.1",
+    "php-di/php-di": "^6.0",
+    "doctrine/common": "^v2.7",
     "guzzlehttp/guzzle": "^6.3",
     "monolog/monolog": "^1.23",
     "symfony/debug" : "^v3.4",
@@ -50,7 +50,7 @@
     "php-mock/php-mock-phpunit": "^2.6"
   },
   "suggest": {
-    "syspass/plugin-authenticator": "^2.1",
+    "syspass/plugin-authenticator": "^v2.2",
     "ext-ldap": "*",
     "ext-curl": "*",
     "ext-xdebug": "*"
@@ -64,6 +64,10 @@
     }
   },
   "config": {
-    "classmap-authoritative": false
+    "classmap-authoritative": false,
+    "platform-check": false,
+    "platform": {
+      "php": "7.4"
+    }
   }
 }