Update dependency @slack/webhook to v7.0.5 #17308

Job	Run time
Setup	3m 13s
Lint	3m 3s
i18n	28s
Admin tests - Chrome	3m 56s
Browser tests	0s
Unit tests (Node 18.12.1)	4m 12s
Performance tests	0s
Unit tests (Node 20.11.1)	3m 56s
Admin-X Settings tests	4m 55s
Comments-UI tests	1m 37s
Unit tests (Node 22.13.1)	3m 54s
Database tests (Node 18.12.1, mysql8)	6m 56s
Ghost-CLI tests	9m 10s
Database tests (Node 20.11.1, mysql8)	5m 48s
Regression tests (Node 20.11.1, mysql8)	3m 10s
Signup-form tests	1m 13s
Database tests (Node 22.13.1, mysql8)	6m 58s
Regression tests (Node 20.11.1, sqlite3)	1m 42s
Database tests (Node 20.11.1, sqlite3)	3m 1s
Tinybird Tests (Web Analytics)	0s
Deploy Tinybird	0s
Publish ${{ matrix.package_name }}	0s
Coverage	9s
All required tests passed or skipped	1s
Canary	0s
	1h 7m 22s

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