cisco_asa,cisco_ftd,juniper_srx: remove redundant regular expression quantifier

[efd6]

Proposed commit message

See title.

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

• Closes [system.auth] redundant regex operation warning in Elasticsearch #4340

Screenshots

[elasticmachine]

💚 Build Succeeded

the below badges are clickable and redirect to their specific view in the CI or DOCS

Expand to view the summary

Build stats

• Start Time: 2023-10-02T21:13:20.841+0000

• Duration: 19 min 15 sec

Test stats 🧪

Test	Results
Failed	0
Passed	59
Skipped	0
Total	59

🤖 GitHub comments

Expand to view the GitHub comments

To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (3/3)	💚
Files	100.0% (10/10)	💚
Classes	100.0% (10/10)	💚
Methods	98.99% (98/99)	👍 68.221
Lines	69.17% (4936/7136)	👎 -30.83
Conditionals	100.0% (0/0)	💚

[efd6]

/test

[elasticmachine]

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

[elasticmachine]

Package cisco_asa - 2.25.1 containing this change is available at https://epr.elastic.co/search?package=cisco_asa

[elasticmachine]

Package cisco_ftd - 2.18.1 containing this change is available at https://epr.elastic.co/search?package=cisco_ftd

[elasticmachine]

Package juniper_srx - 1.17.1 containing this change is available at https://epr.elastic.co/search?package=juniper_srx