[Github] Dependabot remove fixReason from request

[kcreddy]

What does this PR do?

• Removes fixReason from httpjson request to fetch dependabot alerts.

fixReason is removed from Github Graph schema and this PR is required to fix errors during poll.
"message": "Field 'fixReason' doesn't exist on type 'RepositoryVulnerabilityAlert'" } ] }

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.

How to test this PR locally

Related issues

• Closes Github Dependabot - GraphQL schema change  #5993

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• Start Time: 2023-04-27T10:11:48.038+0000

• Duration: 18 min 58 sec

Test stats 🧪

Test	Results
Failed	0
Passed	34
Skipped	0
Total	34

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (5/5)	💚
Files	100.0% (5/5)	💚
Classes	100.0% (5/5)	💚
Methods	100.0% (64/64)	💚 3.03
Lines	93.81% (985/1050)	👍 25.592
Conditionals	100.0% (0/0)	💚

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

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Package github - 1.10.2 containing this change is available at https://epr.elastic.co/search?package=github