Update cfn-nag requirement from >= 0.6.7, < 0.8.0 to >= 0.6.7, < 0.9.0

[dependabot[bot]]

Updates the requirements on cfn-nag to permit the latest version.

Release notes

Sourced from cfn-nag's releases.

v0.6.23

Changes

• Fix Accept header for Github Action dispatch @​arothian (#516)

Commits

• 427e432 Fix Accept header for Github Action dispatch (#516)
• 673eb05 - Fix release triggers to homebrew and SAR (#515)
• 281132b #500 Added new rule for Kendra Index KmsKeyId (#501)
• 90fead8 #379 enable encryption check for DLM LifecyclePolicy CrossRegionCopy Actions ...
• ded116d #503 adding rule for eks cluster encryption config provider (#505)
• f98a736 #503 encryption rule for dynamodb accelerator clusters (#506)
• bc88608 #503 rule to ensure cloudwatchlogs loggroups are encrypted (#507)
• 403e58b #503 ElasticsearchcDomain should have NodeToNodeEncryptionOptions enabled (#508)
• aa30f3b CloudWatchLogs LogGroup should specify RetentionInDays to expire the log (#510)
• 5d8d423 stelligent/cfn_nag#498 New rule: (#499)
• Additional commits viewable in compare view

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