ADAP-1135: Update dbt-adapters ref to point to the subdirectory

[mikealfare]

No description provided.

[github-actions]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the dbt-bigquery contributing guide.

[github-actions]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the dbt-bigquery contributing guide.

[github-actions]

The backport to 1.8.latest failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-1.8.latest 1.8.latest
# Navigate to the new working tree
cd .worktrees/backport-1.8.latest
# Create a new branch
git switch --create backport-1459-to-1.8.latest
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 ce6691dc59220b6eb8e2b8d42a57f31d220101a6
# Push it to GitHub
git push --set-upstream origin backport-1459-to-1.8.latest
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-1.8.latest

Then, create a pull request where the base branch is 1.8.latest and the compare/head branch is backport-1459-to-1.8.latest.