chore(deps): update pnpm to v8.12.0 #833

Job	Run time
Install	17s
Build Tests	51s
Lint	36s
Floating Deps Test	52s
Default Tests	46s
[email protected]	38s
[email protected]	42s
ember-lts-3.28	1m 1s
ember-4.0	49s
ember-lts-4.4	1m 23s
ember-release	58s
ember-beta	58s
ember-canary	48s
ember-release + embroider-safe	1m 4s
ember-release + embroider-optimized	55s
ember-lts-3.28 + embroider-optimized	1m 2s
ember-lts-4.4 + embroider-optimized	1m 18s
Release	36s
	15m 34s

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