Upgrade jsbundling-rails to skip unnecessary Yarn install

[aduth]

🛠 Summary of changes

Upgrades jsbundling-rails to the latest version to use new feature allowing us to skip an extra yarn install, which is unnecessary in both CI and deployment, since we already install by that point. This should hopefully speed things up slightly.

identity-idp/deploy/build

Lines 27 to 34 in 2cf06f7

	if [ "$IDP_LOCAL_DEPENDENCIES" == "true" ]
	then
	bundle install --jobs 4 --local
	yarn install --production --frozen-lockfile --offline --cache-folder .yarn-cache
	else
	bundle install --jobs 4
	yarn install --production --frozen-lockfile --cache-folder .yarn-cache
	fi

identity-idp/.gitlab-ci.yml

Lines 86 to 87 in 2cf06f7

	- *yarn_install
	- bundle exec rake assets:precompile

identity-idp/.gitlab-ci.yml

Lines 192 to 193 in 2cf06f7

	- *yarn_production_install
	- bundle exec rake assets:precompile

Release notes: https://github.com/rails/jsbundling-rails/releases/tag/v1.1.2

Feature pull request: rails/jsbundling-rails#150

📜 Testing Plan

• GitLab build should pass
• Test in deployed environment (Edit: Done)

[aduth]

I tested this in my personal sandbox.