chore(deps): update dependency remark-autolink-headings to v8 #2578

Job	Run time
Lint addon	45s
Tests - Floating Dependencies	1m 0s
Typecheck typescript@5.0	41s
Tests	1m 4s
Typecheck typescript@5.1	42s
Typecheck typescript@5.2	45s
Typecheck typescript@5.3	46s
Tests - ember-lts-3.28	1m 2s
Tests - ember-release	1m 14s
Tests - ember-beta	59s
Tests - ember-canary	1m 16s
Tests - embroider-safe	1m 1s
Tests - embroider-optimized	1m 4s
	12m 19s

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