fix: address all review comments and restore issue template version update

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- Add issue template version update back with correct 'OpenSourcePOS' casing
- Fix version list inconsistency (add 3.3.8 to feature_request.yml, align with bug report.yml)
- Fix changelog special characters issue by using temp file instead of inline sed
- Keep versions in sync between both templates

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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f