Use patience algorithm for diffs

This should prevent us from generating different diffs and adding noise
to our PRs. Patience seems like a good one; it generated a diff that I
felt was easier to read in the case of the yarn.lock optionator section.

ci/dev/diff-vscode.sh

@@ -6,7 +6,7 @@ main() {
 
   cd ./lib/vscode
   git add -A
-  git diff HEAD --full-index > ../../ci/dev/vscode.patch
+  git diff HEAD --patience --full-index > ../../ci/dev/vscode.patch
 }
 
 main "$@"