pass PYTHON_VERSION

Author: blink1073

.evergreen/config.yml

@@ -206,7 +206,7 @@ functions:
       params:
         binary: bash
         working_dir: "src"
-        include_expansions_in_env: [VERSION, TOPOLOGY, AUTH, SSL, ORCHESTRATION_FILE, PYTHON_BINARY,
+        include_expansions_in_env: [VERSION, TOPOLOGY, AUTH, SSL, ORCHESTRATION_FILE, PYTHON_BINARY, PYTHON_VERSION,
           STORAGE_ENGINE, REQUIRE_API_VERSION, DRIVERS_TOOLS, TEST_CRYPT_SHARED, AUTH_AWS, LOAD_BALANCER]
         args: [.evergreen/just.sh, run-server, "${TEST_NAME}"]
     - command: expansions.update
@@ -227,7 +227,7 @@ functions:
       type: test
       params:
         include_expansions_in_env: [AUTH, SSL, AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY,
-          AWS_SESSION_TOKEN, COVERAGE, PYTHON_BINARY, LIBMONGOCRYPT_URL, MONGODB_URI,
+          AWS_SESSION_TOKEN, COVERAGE, PYTHON_BINARY, LIBMONGOCRYPT_URL, MONGODB_URI, PYTHON_VERSION,
           DISABLE_TEST_COMMANDS, GREEN_FRAMEWORK, NO_EXT, COMPRESSORS, MONGODB_API_VERSION, DEBUG_LOG,
           ORCHESTRATION_FILE, OCSP_SERVER_TYPE]
         binary: bash

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

@@ -31,7 +31,7 @@ if [ ! -d $BIN_DIR ]; then
   . $ROOT/.evergreen/utils.sh
 
   if [ -z "${PYTHON_BINARY:-}" ]; then
-      if [ -n "${PYTHON_VERSION}" ]; then
+      if [ -n "${PYTHON_VERSION:-}" ]; then
         PYTHON_BINARY=$(get_python_binary $PYTHON_VERSION)
       else
         PYTHON_BINARY=$(find_python3)