Update references to master branch.

ref enthought/mayavi#1330

.github/workflows/main.yml

@@ -4,10 +4,10 @@ on:
     - cron: "0 0 * * *"
   push:
     branches:
-      - master
+      - main
   pull_request:
     branches:
-      - master
+      - main
 jobs:
   script:
     runs-on: ubuntu-latest
@@ -39,10 +39,10 @@ jobs:
           private-key: ${{ secrets.SSH_PRIVATE_KEY }}
       - name: install
         run: |
-          (cd mayavi; git fetch origin; git checkout master; git reset --hard origin/master; git branch -a)
+          (cd mayavi; git fetch origin; git checkout main; git reset --hard origin/main; git branch -a)
           pip3 install -U pip setuptools
           pip3 install -r ./requirements.txt
-          curl -o- https://raw.githubusercontent.com/transifex/cli/master/install.sh | bash
+          curl -o- https://raw.githubusercontent.com/transifex/cli/main/install.sh | bash
           mv tx /usr/local/bin/tx
       - name: update
         env:
@@ -57,7 +57,7 @@ jobs:
           git config --global user.email $GITHUB_REPOSITORY
           git config --global user.name $GITHUB_REPOSITORY
       - name: commit
-        if: contains(github.event.head_commit.message, '[ci skip]') == false && contains(github.ref, 'master')
+        if: contains(github.event.head_commit.message, '[ci skip]') == false && contains(github.ref, 'main')
         env:
           JOB_ID: ${{ steps.jobs.outputs.job_id }}
           HTML_URL: ${{ steps.jobs.outputs.html_url }}
@@ -67,4 +67,4 @@ jobs:
           $HTML_URL"
           git remote -v
           git remote add github [email protected]:$GITHUB_REPOSITORY.git
-          git push github master
+          git push github main