Warning: remove v21.06 from workflow fron now on

Author: fredroy

.github/workflows/macos.yml

@@ -13,7 +13,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [macos-10.15]
-        sofa_branch: [master, v21.06]
+        sofa_branch: [master]
     env:
       SOFA_ROOT: /opt/sofa
       SOFA_OS: MacOS

.github/workflows/ubuntu.yml

@@ -13,7 +13,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-20.04]
-        sofa_branch: [master, v21.06]
+        sofa_branch: [master]
     env:
       SOFA_ROOT: /opt/sofa
       SOFA_OS: Linux