Stylelint tests failing now that Drupal 11.2 has been released.

Problem/Motivation

Running with gitlab-runner 18.1.1 (2b813ade)
  on gitlab-runner-649d7d7d9-xlf45 s8ex1X2yJ, system ID: r_XBbVkHr1KPET
Resolving secrets
Preparing the "kubernetes" executor
00:00
"CPURequest" overwritten with "2"
Using Kubernetes namespace: gitlab-runner
Using Kubernetes executor with image registry.gitlab.com/drupal-infrastructure/drupalci/drupalci-environments/php-8.3-ubuntu-apache:production ...
Using attach strategy to execute scripts...
Using effective pull policy of [] for container helper
Using effective pull policy of [] for container init-permissions
Using effective pull policy of [] for container build
Preparing environment
00:31
Using FF_USE_POD_ACTIVE_DEADLINE_SECONDS, the Pod activeDeadlineSeconds will be set to the job timeout: 1h0m0s...
Waiting for pod gitlab-runner/runner-s8ex1x2yj-project-187350-concurrent-1-qzpyp0jj to be running, status is Pending
Running on runner-s8ex1x2yj-project-187350-concurrent-1-qzpyp0jj via gitlab-runner-649d7d7d9-xlf45...
Getting source from Git repository
00:01
Gitaly correlation ID: 1988750648
Fetching changes...
Initialized empty Git repository in /builds/issue/environment_indicator-3536522/.git/
Created fresh repository.
Checking out 572d59b3 as detached HEAD (ref is 3536522-insufficient-permission-check)...
Skipping Git submodules setup
Downloading artifacts
00:07
Downloading artifacts for composer (5921805)...
Downloading artifacts from coordinator... ok        correlation_id= host=drupal-gitlab-job-artifacts.s3.us-west-2.amazonaws.com id=5921805 responseStatus=200 OK token=64_dSL_KU
Executing "step_script" stage of the job script
$ if [ ! -d "$CI_PROJECT_DIR/$_WEB_ROOT/core/node_modules" ]; then # collapsed multi-line command
$ cd $CI_PROJECT_DIR/$_WEB_ROOT/core && corepack enable && yarn add @gitlab-formatters/stylelint-formatter-gitlab
! Corepack is about to download https://repo.yarnpkg.com/4.9.1/packages/yarnpkg-cli/bin/yarn.js
➤ YN0000: · Yarn 4.9.1
➤ YN0000: ┌ Resolution step
Resolution step
00:01
➤ YN0000: └ Completed
➤ YN0000: ┌ Fetch step
Fetch step
00:03
➤ YN0000: └ Completed in 3s 608ms
➤ YN0000: ┌ Link step
Link step
00:01
➤ YN0000: └ Completed in 0s 269ms
➤ YN0000: · Done in 4s 58ms
$ cd $DRUPAL_PROJECT_FOLDER && pwd
/builds/issue/environment_indicator-3536522/web/modules/custom/environment_indicator-3536522
$ echo "Stylelint version $(${CI_PROJECT_DIR}/${_WEB_ROOT}/core/node_modules/.bin/stylelint --version)"
Stylelint version 16.19.1
$ $CI_PROJECT_DIR/$_WEB_ROOT/core/node_modules/.bin/stylelint --ignore-path ./.stylelintignore --config $CI_PROJECT_DIR/$_WEB_ROOT/core/.stylelintrc.json ./**/*.css --formatter verbose --color $_STYLELINT_EXTRA || true
css/environment_indicator.css
  15:5  ✖  Expected "rgba" to be "rgb"  color-function-alias-notation
  16:5  ✖  Expected "rgba" to be "rgb"  color-function-alias-notation
  17:5  ✖  Expected "rgba" to be "rgb"  color-function-alias-notation
  92:5  ✖  Expected "rgba" to be "rgb"  color-function-alias-notation
✖ 4 problems (4 errors, 0 warnings)
  4 errors potentially fixable with the "--fix" option.
1 source checked
  /builds/issue/environment_indicator-3536522/web/modules/custom/environment_indicator-3536522/css/environment_indicator.css
4 errors found
  color-function-alias-notation: 4 (maybe fixable)
$ echo -e "\e[0Ksection_start:`date +%s`:generate_stylelint_artifact[collapsed=true]\r\e[0KGenerating stylelint artifact"
Generating stylelint artifact
00:08
Uploading artifacts for failed job
00:01
Uploading artifacts...
gl-codequality.json: found 1 matching artifact files and directories 
Uploading artifacts as "archive" to coordinator... 201 Created  correlation_id=1762200839 id=5921811 responseStatus=201 Created token=64_dSL_KU
Uploading artifacts...
gl-codequality.json: found 1 matching artifact files and directories 
Uploading artifacts as "codequality" to coordinator... 201 Created  correlation_id=3268023331 id=5921811 responseStatus=201 Created token=64_dSL_KU
Cleaning up project directory and file based variables
00:01
ERROR: Job failed: command terminated with exit code 1

Steps to reproduce

See https://git.drupalcode.org/issue/environment_indicator-3536522/-/jobs/59...

Proposed resolution

Do what stylelint says to do and remove rgba in favor of rgb.

Remaining tasks

User interface changes

API changes

Data model changes