Suppress useless default branch name hint [ci skip]

.github/workflows/check_dependencies.yml

@@ -22,6 +22,7 @@ jobs:
       - name: git config
         run: |
           git config --global advice.detachedHead 0
+          git config --global init.defaultBranch garbage
       - uses: actions/checkout@v2
       - run: autoconf
       - name: Run configure

.github/workflows/macos.yml

@@ -15,6 +15,7 @@ jobs:
       - name: git config
         run: |
           git config --global advice.detachedHead 0
+          git config --global init.defaultBranch garbage
       - uses: actions/checkout@v2
         with:
           path: src

.github/workflows/mingw.yml

@@ -30,6 +30,7 @@ jobs:
           git config --global core.autocrlf false
           git config --global core.eol lf
           git config --global advice.detachedHead 0
+          git config --global init.defaultBranch garbage
       - uses: actions/checkout@v2
         with:
           path: src

.github/workflows/mjit.yml

@@ -23,6 +23,7 @@ jobs:
       - name: git config
         run: |
           git config --global advice.detachedHead 0
+          git config --global init.defaultBranch garbage
       - uses: actions/checkout@v2
         with:
           path: src

.github/workflows/ubuntu.yml

@@ -37,6 +37,7 @@ jobs:
       - name: git config
         run: |
           git config --global advice.detachedHead 0
+          git config --global init.defaultBranch garbage
       - uses: actions/checkout@v2
         with:
           path: src

.github/workflows/windows.yml

@@ -41,6 +41,7 @@ jobs:
           git config --global core.autocrlf false
           git config --global core.eol lf
           git config --global advice.detachedHead 0
+          git config --global init.defaultBranch garbage
       - uses: actions/checkout@v2
         with:
           path: src