Fix ms-python.mypy-type-checker

Co-authored-by: Ona <[email protected]>

Author: filiptronicek

extensions.json

@@ -877,10 +877,9 @@
   "ms-python.mypy-type-checker": {
     "repository": "https://github.com/microsoft/vscode-mypy",
     "custom": [
-      "python -m venv .venv",
-      "source .venv/bin/activate",
-      "python -m pip install nox",
-      "python -m pip install -t ./bundled/libs --no-cache-dir --no-user --implementation py --no-deps --upgrade -r ./requirements.txt",
+      "/usr/bin/python3 -m venv .venv",
+      "source .venv/bin/activate && python -m pip install nox",
+      "source .venv/bin/activate && python -m pip install -t ./bundled/libs --no-cache-dir --no-user --implementation py --no-deps --upgrade -r ./requirements.txt",
       "npm ci --prefer-offline",
       "npm run vsce-package"
     ],