Replace deprecated install command (#19968)

The `--frozen-lockfile` flag is not supported by Yarn v3. It has been
replaced by the Yarn v3 equivalent, which is `--immutable`.

Additionally, the `deps-install` script was deleted and this command
was inlined in the CircleCI configuration. I don't think we need to
maintain a separate script just for one command.

.circleci/config.yml

@@ -363,8 +363,7 @@ jobs:
             fi
       - run:
           name: Install deps
-          command: |
-            .circleci/scripts/deps-install.sh
+          command: yarn --immutable
       - save_cache:
           key: dependency-cache-v1-{{ checksum "yarn.lock" }}
           paths:

.circleci/scripts/deps-install.sh

@@ -1,9 +0,0 @@
-#!/usr/bin/env bash
-
-# Print commands and their arguments as they are executed.
-set -x
-# Exit immediately if a command exits with a non-zero status.
-set -e
-
-yarn install --frozen-lockfile
-