Remove duplicate extension

Author: ncalteen

.devcontainer/devcontainer.json

@@ -16,7 +16,6 @@
         "github.copilot-chat",
         "github.vscode-github-actions",
         "github.vscode-pull-request-github",
-        "me-dutour-mathieu.vscode-github-actions",
         "redhat.vscode-yaml",
         "rvest.vs-code-prettier-eslint",
         "yzhang.markdown-all-in-one"