Fix pip upgrade in TestSuite checks (#1715)

Author: adnaanbheda

scripts/install

@@ -12,8 +12,8 @@ if [ -z "$GITHUB_ACTIONS" ]; then
  "$PYTHON" -m venv "$VENV"
  PIP="$VENV/bin/pip"
 else
- PIP="pip"
+ PIP="$PYTHON -m pip"
 fi
 
-"$PIP" install -U pip
-"$PIP" install -r "$REQUIREMENTS"
+${PIP} install -U pip
+${PIP} install -r "$REQUIREMENTS"