问如何更改云函数部署中使用的bundler版本？

EN

source "https://rubygems.org"

ruby "~> 2.7.0"

git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }

gem "google-cloud-firestore"

$ gcloud functions deploy my_func --region=us-central1 --memory=128MB --runtime=ruby27

(snip)

ERROR: (gcloud.functions.deploy) OperationError: code=3, message=Build failed: Fetching gem metadata from https://rubygems.org/..........
Resolving dependencies...
Bundler found conflicting requirements for the Ruby version:
  In Gemfile:
    Ruby (~> 2.7.0)

    google-cloud-firestore was resolved to 2.4.1, which depends on
      google-cloud-firestore-v1 (~> 0.0) was resolved to 0.4.0, which depends on
        gapic-common (~> 0.3) was resolved to 0.4.0, which depends on
google-protobuf (~> 3.15, >= 3.15.2) was resolved to 3.15.5, which
depends on
            Ruby (< 3.1.dev, >= 2.3)

    google-cloud-firestore was resolved to 2.4.1, which depends on
      google-cloud-firestore-v1 (~> 0.0) was resolved to 0.4.0, which depends on
        gapic-common (~> 0.3) was resolved to 0.4.0, which depends on
          grpc (~> 1.36) was resolved to 1.36.0, which depends on
            Ruby (< 3.1.dev, >= 2.4); Error ID: af32a539

source "https://rubygems.org"

ruby "~> 2.7.0"

git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }


gem "bundler", "!= 2.2.8", "!= 2.2.9" 

$ gcloud functions deploy my_func --region=us-central1 --memory=128MB --runtime=ruby27

(snip)

Resolving dependencies...
Bundler could not find compatible versions for gem "bundler":
  In Gemfile:
    bundler (!= 2.2.8, != 2.2.9)

  Current Bundler version:
    bundler (2.2.9)