checkpoint,github,hid_bravura_monitor: make types match

[efd6]

What does this PR do?

Makes fields with the same name agree in type.

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

• Fixes [hid_bravura_monitor] Field type conflict for winlog.time_created #7708
• Fixes Field type conflict for checkpoint.subs_exp #7709
• Fixes [github] Field type conflict for github.repository.description #7710

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Build stats

• Start Time: 2023-09-08T06:58:12.103+0000

• Duration: 18 min 45 sec

Test stats 🧪

Test	Results
Failed	0
Passed	101
Skipped	0
Total	101

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (8/8)	💚
Files	100.0% (8/8)	💚
Classes	100.0% (8/8)	💚
Methods	98.131% (105/107)	👍 12.575
Lines	92.068% (2426/2635)	👎 -0.527
Conditionals	100.0% (0/0)	💚

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

[bhapas]

LGTM

[elasticmachine]

Package checkpoint - 1.24.0 containing this change is available at https://epr.elastic.co/search?package=checkpoint

[elasticmachine]

Package github - 1.20.1 containing this change is available at https://epr.elastic.co/search?package=github

[elasticmachine]

Package hid_bravura_monitor - 1.10.1 containing this change is available at https://epr.elastic.co/search?package=hid_bravura_monitor