Merge branch '3466679-drupal-11-support' into '3.0.x'

Drupal 11 support

See merge request !15

.gitlab-ci.yml

+include:
+  - project: $_GITLAB_TEMPLATES_REPO
+    ref: $_GITLAB_TEMPLATES_REF
+    file:
+      - '/includes/include.drupalci.main.yml'
+      - '/includes/include.drupalci.variables.yml'
+      - '/includes/include.drupalci.workflows.yml'
+variables:
+  OPT_IN_TEST_NEXT_MINOR: 1
+  OPT_IN_TEST_NEXT_MAJOR: 1
+  RUN_JOB_UPGRADE_STATUS: 1
+cspell:
+  allow_failure: false
+phpcs:
+  allow_failure: false
+phpstan:
+  allow_failure: false
+phpstan (next minor):
+  allow_failure: false
+phpstan (next major):
+  allow_failure: false
+phpunit (next minor):
+  allow_failure: false
+phpunit (next major):
+  allow_failure: false
+upgrade status:
+  allow_failure: false

bootstrap4.info.yml

 name: Bootstrap4
 type: theme
 description: 'Theme with Bootstrap 4 css library'
-core_version_requirement: ^9.4 || ^10
+core_version_requirement: ^10.2 || ^11.0
 'base theme': stable9
 starterkit: true
 generator: 'starterkit_theme:10.0.5'