release 1.3.6

[github-actions]

Checklist

1. Check if the version, base, and target branches are as you desire.
2. Make sure you have woorelease installed and set up.
3. Go to your local repo clone, and check out this PR to be able to commit any potential adjustments.

   git fetch origin release/1.3.6
   git checkout release/1.3.6

4. Simulate the release locally

   woorelease simulate --product_version=1.3.6  --generate_changelog https://github.com/woocommerce/pinterest-for-woocommerce/tree/release/1.3.6

   Note: Select y when prompted: "Would you like to add/delete them in the svn working copy?"
5. The changelog is correct.
   Check if some entries are missing, need rewording, or need to be deleted. You can edit respective PRs by changing their title, ### Changelog entry section, or assigning the changelog: none label.
   You can also edit the changelog manually in the woorelease release step later.
6. Automated tests are passing.
7. Test the package
   1. Install the /tmp/pinterest-for-woocommerce.zip file on a test site
   2. Confirm it activates without warnings/errors and is showing the right versions
   3. Run a few basic smoke tests

Next steps

1. Do the final release

   woorelease release --product_version=1.3.6   --generate_changelog https://github.com/woocommerce/pinterest-for-woocommerce/tree/release/1.3.6
   

   When prompted for changelog entries, double-check and apply any changes if needed.
2. Go to https://github.com/woocommerce/pinterest-for-woocommerce/releases/1.3.6, generate GitHub release notes, and paste them as a comment here.
3. Merge this PR after the new release is successfully created and the version tags are updated.
4. Merge trunk to develop (if applicable for this repo).