Increase load benchmark repetitions to 5

[sarahchen6]

What Does This Do

Increase the petclinic and insecure-bank load benchmark repetition count to 5

Motivation

Improve load benchmark stability

Additional Notes

This may increase CI runtime, but let's see first if it improves benchmark stability

Contributor Checklist

• Format the title according the contribution guidelines
• Assign the type: and (comp: or inst:) labels in addition to any useful labels
• Don't use close, fix or any linking keywords when referencing an issue.
  Use solves instead, and assign the PR milestone to the issue
• Update the CODEOWNERS file on source file addition, move, or deletion
• Update the public documentation in case of new configuration flag or behavior

Jira ticket: [PROJ-IDENT]

[datadog-official]

🎯 Code Coverage
• Patch Coverage: 100.00%
• Total Coverage: 59.70% (-0.01%)

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