Update dependency file-type to v21 [SECURITY] #42857

Job	Run time
Setup	51s
Check app version bump	33s
Check migration integrity	32s
Admin tests - Chrome	3m 56s
Lint	2m 31s
i18n	45s
Unit tests (Node 22.18.0)	8m 5s
Acceptance tests (Node 22.18.0, mysql8)	10m 1s
Comments-UI tests	1m 35s
Legacy tests (Node 22.18.0, sqlite3)	2m 12s
Legacy tests (Node 22.18.0, mysql8)	4m 9s
Signup-form tests	50s
Admin-X Settings tests	9m 54s
Acceptance tests (Node 22.18.0, sqlite3)	5m 26s
Build & Publish Artifacts	8m 17s
ActivityPub tests	1m 33s
Build E2E Public App Assets	50s
Tinybird Tests	0s
Deploy Tinybird	0s
Build ${{ matrix.package_name }}	0s
Publish ${{ matrix.package_name }}	0s
Build E2E Docker Image	1m 16s
Trigger Pro CD	4s
Ghost-CLI tests	1m 35s
E2E Tests (6/8)	10m 0s
E2E Tests (2/8)	12m 29s
E2E Tests (5/8)	12m 21s
E2E Tests (3/8)	13m 4s
E2E Tests (4/8)	10m 41s
E2E Tests (1/8)	11m 10s
E2E Tests (7/8)	13m 17s
E2E Tests (8/8)	8m 9s
Publish Ghost to npm	0s
Create GitHub Release	0s
Coverage	0s
Merge Reports	45s
All required tests passed or skipped	2s
	2h 36m 53s

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