Drop unused lfs:true from integration-test checkout

The repo has no .gitattributes and no LFS-tracked files, so passing
lfs: true to actions/checkout just makes it shell out to git-lfs,
which isn't installed in the gramps-ci image. The 3.9 MB sample
sqz under TMGimporter/tests/ is committed directly.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: eduralph

.github/workflows/ci.yml

@@ -165,8 +165,6 @@ jobs:
       options: --init
     steps:
       - uses: actions/checkout@v4
-        with:
-          lfs: true
 
       - name: Run plugin registration tests
         env: