cisco_{asa,ftd}: allow configuration of time zones

[efd6]

What does this PR do?

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Author's Checklist

• [ ]

How to test this PR locally

Related issues

• Updates [Cisco ASA] Timezone Offset #5080

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• Start Time: 2023-01-30T22:44:44.183+0000

• Duration: 17 min 57 sec

Test stats 🧪

Test	Results
Failed	0
Passed	43
Skipped	0
Total	43

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (2/2)	💚
Files	100.0% (2/2)	💚 2.284
Classes	100.0% (2/2)	💚 2.284
Methods	100.0% (36/36)	💚 8.538
Lines	76.15% (2880/3782)	👎 -16.714
Conditionals	100.0% (0/0)	💚

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Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[kcreddy]

LGTM 👍🏼

[elasticmachine]

Package cisco_asa - 2.13.0 containing this change is available at https://epr.elastic.co/search?package=cisco_asa

[elasticmachine]

Package cisco_ftd - 2.9.0 containing this change is available at https://epr.elastic.co/search?package=cisco_ftd