chore(deps): update pnpm to v8.12.0 #832

Job	Run time
Install	22s
Lint	25s
Build Tests	34s
Default Tests	40s
[email protected]	40s
Floating Deps Test	48s
[email protected]	44s
ember-lts-3.28	48s
ember-4.0	1m 6s
ember-lts-4.4	52s
ember-release	56s
ember-beta	50s
ember-canary	46s
ember-release + embroider-safe	47s
ember-release + embroider-optimized	55s
ember-lts-3.28 + embroider-optimized	57s
ember-lts-4.4 + embroider-optimized	57s
Release	0s
	13m 7s

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