Fixing beta version syntax

[jeniawhite]

What does this PR do?

Fixing the syntax of the manifest beta version

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.

[elasticmachine]

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Build stats

• Start Time: 2023-02-14T14:46:37.767+0000

• Duration: 17 min 8 sec

Test stats 🧪

Test	Results
Failed	0
Passed	2
Skipped	0
Total	2

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (0/0)	💚
Files	100.0% (0/0)	💚
Classes	100.0% (0/0)	💚
Methods	25.0% (1/4)	❕
Lines	100.0% (0/0)	💚
Conditionals	100.0% (0/0)	💚

[elasticmachine]

Package cloud_security_posture - 1.2.10-beta.3 containing this change is available at https://epr.elastic.co/search?package=cloud_security_posture