Update CVE-2021-44528.yaml

[jakxx]

Update to improve detection logic that checks headers for ruby specific values

PR Information

PR to fix false positive. Added ruby-specific detection logic

Template validation

Simulated local HTTP server with ruby-specific headers (true positive) and non-ruby specific headers (false positive)

• [ x] Validated with a host running a vulnerable version and/or configuration (True Positive)
• [ x] Validated with a host running a patched version and/or configuration (avoid False Positive)

Additional Details (leave it blank if not applicable)

Additional References:

• Nuclei Template Creation Guideline
• Nuclei Template Matcher Guideline
• Nuclei Template Contribution Guideline
• PD-Community Discord server