Pin Bun version to 1.2.22

Bun 1.2.23 introduced a regression causing false positives for nested
test() detection, breaking previously working tests with "test() inside
another test() is not yet implemented" errors.

Pinning to 1.2.22 until this regression is fixed.

oven-sh/bun#5090

Co-Authored-By: Claude <noreply@anthropic.com>

Author: dahlia

.github/workflows/build.yaml

@@ -195,7 +195,7 @@ jobs:
         cache: pnpm
     - uses: oven-sh/setup-bun@v1
       with:
-        bun-version: latest
+        bun-version: 1.2.22
     - run: pnpm install
     - run: pnpm run --recursive test:bun
 

mise.toml

@@ -1,5 +1,6 @@
 [tools]
-bun = "latest"
+# Bun version should be kept in sync with GitHub Actions workflows
+bun = "1.2.22"
 # Deno version should be kept in sync with GitHub Actions workflows
 deno = "2.5.0"
 node = "22"