fix: Remove potentially unnecessary pip installs (#36649)

scripts/bootstrap-py3-venv

@@ -50,10 +50,6 @@ if [ -z "${SENTRY_PYTHON_VERSION-}" ] && ! query-valid-python-version; then
     return 1
 fi
 
-python3 -m pip install -U pip || {
-    echo "bootstrap failed!"
-    return 1
-}
 python3 -m venv "${venv_name}" || {
     echo "bootstrap failed!"
     return 1
@@ -62,10 +58,6 @@ source "${venv_name}/bin/activate" || {
     echo "bootstrap failed!"
     return 1
 }
-python3 -m pip install -U pip wheel || {
-    echo "bootstrap failed!"
-    return 1
-}
 make install-py-dev || {
     echo "bootstrap failed!"
     return 1