bump up artifactory version to 7.77.7

[shahiinn]

PR Checklist

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• [ ] Title of the PR starts with installer/product name (e.g. [ansible/artifactory])
• [ ] CHANGELOG.md updated
• [ ] Variables and other changes are documented in the README.md

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Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

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