Bump feedgen from 0.3.2 to 0.9.0

[dependabot[bot]]

Bumps feedgen from 0.3.2 to 0.9.0.

Commits

• ffe3e4d Release 0.9.0
• 2b77fd5 Introduce Bandit Security Linter
• f57a01b Merge pull request from GHSA-g8q7-xv52-hf9f
• 0eb12f9 Prevent XML Denial of Service Attacks
• 9440cca Update Python Versions
• e942a08 Documentation Update
• 771b450 Add Security Policy
• 5a68e68 Make Generator Optional (Atom)
• 26b64ca Properly Parse text/xml
• d1e77c7 Use more appropriate exception class for unimplemented functionality
• Additional commits viewable in compare view

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