fix(typescript-estree): fix decorator regression for pre TS4.8

[bradzacher]

PR Checklist

• Addresses an existing open issue: fixes Bug: [no-unused-vars] 'Component' is defined but never used #5571
• That issue was marked as accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

#5573 will add CI tests for this, so for now you'll have to trust me that this fixes things

[typescript-eslint]

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