Update ci.yml

Removed MediaWiki 1.40 because of:

1. I don't remember that something related to Semantic MediaWiki has ever officially supported a non-LTS version of MediaWiki
2. Tests are failing for MediaWiki 1.40, it's not worth fixing it as MediaWiki 1.40 is non-LTS, because of previous reasons.

.github/workflows/ci.yml

@@ -38,13 +38,6 @@ jobs:
  database_image: "mariadb:latest"
  coverage: false
  experimental: true
- - mediawiki_version: '1.40'
- smw_version: dev-master
- php_version: 8.1
- database_type: mysql
- database_image: "mariadb:latest"
- coverage: false
- experimental: true
 
  env:
  MW_VERSION: ${{ matrix.mediawiki_version }}