Change default branch to master (temporary)

[sanemat]

gatsby ci got error.
because the default branch of gatsbyjs/gatsby-starter-wordpress-blog is main.
Could you change default branch to master (temporary)?

[main 450cd6b] chore(create-gatsby): Use new image plugin (#29356)
 9 files changed, 17274 insertions(+), 1161 deletions(-)
 create mode 100644 src/templates/Page.js
 rename src/templates/{blog-post.js => Post.js} (100%)
 create mode 100644 yarn.lock
error: src refspec master does not match any.
error: failed to push some refs to 'https://****************************************@github.com/gatsbyjs/gatsby-starter-wordpress-blog.git'

Exited with code exit status 1

CircleCI received exit code 1

https://app.circleci.com/pipelines/github/gatsbyjs/gatsby/57590/workflows/b859ef00-b79a-4c8d-989c-c538f7f9e033/jobs/612613

  if [ -n "$(git status --porcelain)" ]; then
    git add .
    git commit -m "$COMMIT_MESSAGE"
    git push origin master
  fi

https://github.com/gatsbyjs/gatsby/blob/936c74ea7ff9965c993541bd8feea82e40c0919b/scripts/publish-starters.sh#L40