fix(ci): use yarn config set for supportedArchitectures

YARN_SUPPORTED_ARCHITECTURES env var doesn't work as JSON in Yarn 3.4.1.
Use yarn config set with --json flag to set each sub-key individually.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: joker23

.github/workflows/dependency-scan.yml

@@ -35,10 +35,13 @@ jobs:
         run: corepack enable
 
       - name: Install dependencies (skip platform-specific optionals)
-        run: yarn install
+        run: |
+          yarn config set supportedArchitectures.os --json '[]'
+          yarn config set supportedArchitectures.cpu --json '[]'
+          yarn config set supportedArchitectures.libc --json '[]'
+          yarn install
         env:
           YARN_ENABLE_IMMUTABLE_INSTALLS: 'false'
-          YARN_SUPPORTED_ARCHITECTURES: '{"os":[],"cpu":[],"libc":[]}'
 
       - name: Generate SBOM
         uses: launchdarkly/gh-actions/actions/dependency-scan/generate-sbom@0a54234f88a428df4163234dbb23ddb7fee8b8ec # main