Update zabbix_maintenance.py

[polcape]

Change to int casting as discussed here #637

SUMMARY

Failed to create maintenance on Zabix 6 and Python3.9

Fixes #637

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

Zabbix maintenance

ADDITIONAL INFORMATION

Creating Zabbix maintenance this error happens

fatal: [server]: FAILED! => {"changed": false, "msg": "Failed to create maintenance: (u'Error -32602: Invalid params., Invalid parameter \"/1/active_since\": an unsigned integer is expected. while sending {\"params\": {\"maintenance_type\": 0, \"active_since\": \"1645364880.0\", \"active_till\": \"1645365660.0\", \"groupids\": [\"32\"], \"timeperiods\": [{\"timeperiod_type\": \"0\", \"start_date\": \"1645365060.0\", \"period\": \"600\"}], \"description\": \"Created by Ansible\", \"hostids\": [], \"name\": \"Test\"}, \"jsonrpc\": \"2.0\", \"method\": \"maintenance.create\", \"auth\": \"dd0f5d574072ce6bc66d511b\", \"id\": 4}', -32602)"}

[codecov]

Codecov Report

Merging #665 (42a7354) into main (deba504) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #665   +/-   ##
=======================================
  Coverage   70.98%   70.98%           
=======================================
  Files          27       27           
  Lines        3550     3550           
  Branches      920      920           
=======================================
  Hits         2520     2520           
  Misses        751      751           
  Partials      279      279           

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[D3DeFi]

Thank you for this contribution! <3

[D3DeFi]

Thank you for this contribution! <3

Will merge once tests pass. I expect sanity for devel branch to fail because this PR doesn't have changes from #666, but that can be ignored safely