chore: optimize gem packaging, bump to v2.9.1

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Merge pull request #32 from Sentia/feature/fix-webhook

Feature/fix webhook

update changelog

Merge pull request #31 from Sentia/feature/fix-issue-for-virtual-account

fix virtual account response

update versions and changelogs

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Merge pull request #26 from Sentia/feature/fix-bug-for-wallet-account

fix bug for wallet account response