Specify Pushover library version in composer.json (#217)

Author: slunak

composer.json

@@ -14,7 +14,7 @@
         "doctrine/orm": "^3.1",
         "gpslab/geoip2": "^2.1",
         "secit-pl/imap-bundle": "^3.1",
-        "serhiy/pushover": "*",
+        "serhiy/pushover": "^1.6",
         "symfony/apache-pack": "^1.0",
         "symfony/console": "7.1.*",
         "symfony/dotenv": "7.1.*",