Updated Git branch "master" to "main" in GitHub actions workflows.

.github/workflows/docs.yml

@@ -6,7 +6,7 @@ on:
       - 'docs/**'
   push:
     branches:
-      - master
+      - main
     paths:
       - 'docs/**'
 

.github/workflows/linters.yml

@@ -4,7 +4,7 @@ on:
   pull_request:
   push:
     branches:
-      - master
+      - main
 
 jobs:
   flake8:

.github/workflows/tests.yml

@@ -4,7 +4,7 @@ on:
   pull_request:
   push:
     branches:
-      - master
+      - main
 
 jobs:
   javascript-tests: