ci: swap buildjet/setup-node for actions/setup-node v6.4.0 #5663

Job	Run time
typecheck / typecheck	24s
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	48s
sdk-compat / Node.js 20.20 (ubuntu-latest)	20s
sdk-compat / Deno Runtime	26s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	53s
sdk-compat / Bun Runtime	20s
sdk-compat / Cloudflare Workers	22s
sdk-compat / Node.js 22.12 (ubuntu-latest)	25s
e2e / 🧪 CLI v3 tests (ubuntu-latest - npm)	18s
units / packages / 🧪 Unit Tests: Packages (1, 1)	47s
e2e / 🧪 CLI v3 tests (ubuntu-latest - pnpm)	22s
units / e2e-webapp / 🧪 E2E Tests: Webapp	35s
units / webapp / 🧪 Unit Tests: Webapp (1, 8)	41s
units / internal / 🧪 Unit Tests: Internal (8, 8)	46s
units / webapp / 🧪 Unit Tests: Webapp (4, 8)	41s
units / internal / 🧪 Unit Tests: Internal (2, 8)	44s
units / webapp / 🧪 Unit Tests: Webapp (8, 8)	38s
units / webapp / 🧪 Unit Tests: Webapp (7, 8)	42s
units / internal / 🧪 Unit Tests: Internal (6, 8)	42s
units / internal / 🧪 Unit Tests: Internal (7, 8)	43s
units / internal / 🧪 Unit Tests: Internal (1, 8)	46s
units / internal / 🧪 Unit Tests: Internal (4, 8)	49s
units / internal / 🧪 Unit Tests: Internal (5, 8)	48s
units / webapp / 🧪 Unit Tests: Webapp (5, 8)	41s
units / internal / 🧪 Unit Tests: Internal (3, 8)	40s
units / webapp / 🧪 Unit Tests: Webapp (3, 8)	48s
units / webapp / 🧪 Unit Tests: Webapp (2, 8)	41s
units / webapp / 🧪 Unit Tests: Webapp (6, 8)	38s
units / packages / 📊 Merge Reports	20s
units / webapp / 📊 Merge Reports	24s
units / internal / 📊 Merge Reports	25s
	18m 37s

Provide feedback