chore: update repo branch name

Author: Lancetnik

.github/workflows/test.yml

@@ -3,7 +3,7 @@ name: Test
 on:
   push:
     branches:
-      - main
+      - master
   pull_request:
     types: [opened, synchronize]
 
@@ -40,7 +40,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
         pydantic-version: ["pydantic-v1", "pydantic-v2"]
       fail-fast: false