PYTHON-5298 Account for update to uv lockfile format

.evergreen/scripts/install-dependencies.sh

@@ -37,7 +37,6 @@ function _pip_install() {
   echo "Installing $2 using pip... done."
 }
 
-
 # Ensure just is installed.
 if ! command -v just >/dev/null 2>&1; then
   # On most systems we can install directly.
@@ -53,7 +52,7 @@ if ! command -v just >/dev/null 2>&1; then
   echo "Installing just... done."
 fi
 
-# Install uv.
+# Fall back to installing uv.
 if ! command -v uv >/dev/null 2>&1; then
   echo "Installing uv..."
   # On most systems we can install directly.

.evergreen/scripts/setup-dev-env.sh

@@ -16,6 +16,22 @@ if [ -f $HERE/test-env.sh ]; then
   . $HERE/test-env.sh
 fi
 
+# Try to use the binaries in the toolchain if available.
+if [ -n "${CI}" ]; then
+  export PATH
+  case "${OSTYPE:?}" in
+  cygwin)
+    PATH="/cygdrive/c/Python/Current:${PATH:-}"
+    ;;
+  darwin*)
+    PATH="/Library/Frameworks/Python.Framework/Versions/Current/bin:${PATH:-}"
+    ;;
+  *)
+    PATH="/opt/python/Current/bin:${PATH:-}"
+    ;;
+  esac
+fi
+
 # Ensure dependencies are installed.
 bash $HERE/install-dependencies.sh