packaging(speedtest): remove dependency with speedtest-cli

speedtest-cli isn't used by the plugin.
It only needs speedtest and we ask to download it from the official website.
By the way, speedtest-cli from debian repositories is in conflict with speedtest-cli from the official website.

Refs: CTOR-952

packaging/centreon-plugin-Applications-Monitoring-Speedtest/deb.json

@@ -1,6 +1,5 @@
 {
     "dependencies": [
-        "libssh-session-perl",
-        "speedtest-cli"
+        "libssh-session-perl"
     ]
 }

packaging/centreon-plugin-Applications-Monitoring-Speedtest/rpm.json

@@ -1,6 +1,5 @@
 {
     "dependencies": [
-        "perl(Libssh::Session)",
-        "speedtest-cli"
+        "perl(Libssh::Session)"
     ]
 }