Move cdxgen checkout to address yarn vs pnpm issue.

Signed-off-by: Caroline Russell <caroline@appthreat.dev>

Author: cerrussell

.github/workflows/snapshot-tests.yml

@@ -22,21 +22,25 @@ jobs:
     steps:
 
       - uses: actions/checkout@v4
-
-      - name: Set up pnpm
-        uses: pnpm/action-setup@v4
+        with:
+          path: cdxgen_src
 
       -  name: cdxgen, custom-json-diff installs
          shell: bash
          env:
            SHELL: bash
          run: |
            rm -rf original_snapshots new_snapshots src_repos
+           cd cdxgen_src
+           corepack enable pnpm
            cdxgen_tarball=$(pnpm pack | tail -1)
            npm install -g "$cdxgen_tarball"
-           git clone https://github.com/appthreat/cdxgen-samples.git original_snapshots
+           cd ..
            python3.12 -m venv .venv
            source .venv/bin/activate && pip install -r test/diff/requirements.txt
+           git clone https://github.com/appthreat/cdxgen-samples.git original_snapshots
+           cd original_snapshots
+           git checkout feature/expand_snapshots_3
 
       - name: Generate scripts
         run: |