update changelog 4.8.0

[suryaaki2]

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Pull Request Type

• Bug fix (non-breaking change which fixes an issue.)
• Enhancement/New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

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Fast Track PR Acceptance Checklist:

• Build is successful and all new and existing tests pass
• Added Unit Test(s)
• Added Integration Test(s)
• Added Test Harness Test(s)
• Documentation Updated

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[mariochampion]

@nvoxland -- do you want to add something about the security changes you mentioned in the pd ticket, or can that just be in the full release notes?