Update build_stubs.yml

.github/workflows/build_stubs.yml

@@ -1,4 +1,4 @@
-name: Build esptool
+name: Build stubs for esptool v3.x
 
 on: [push, pull_request]
 
@@ -16,7 +16,6 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install pyinstaller
           pip install --user -e .
       - name: Build stub
         run: |