Update pip install command in buildbot_functions.sh

Removed 'dev' package from pip install command.

Author: vitalybuka

zorg/buildbot/builders/sanitizers/buildbot_functions.sh

@@ -83,7 +83,7 @@ export LIT_OPTS="--time-tests"
 [[ -f llvm-venv/bin/activate ]] || python3 -m venv llvm-venv
 . llvm-venv/bin/activate
 pip install --upgrade pip
-pip install psutil pyyaml Pygments dev
+pip install psutil pyyaml Pygments
 
 CMAKE_COMMON_OPTIONS+=" -DPython3_EXECUTABLE=$ROOT/llvm-venv/bin/python"