Update some composer dependancies

Update some composer dependancies

Update composer/semver from 1.4.2 to 1.5.0

https://github.com/composer/semver/releases/tag/1.5.0
https://github.com/composer/semver/compare/1.4.2...1.5.0

Update composer/spdx-licenses from 1.4.0 to 1.5.1

https://github.com/composer/spdx-licenses/compare/1.4.0...1.5.1
https://github.com/composer/spdx-licenses/releases/tag/1.5.1

Update mediawiki/codesniffer from 25.0.0 to 26.0.0

https://github.com/wikimedia/mediawiki-tools-codesniffer/releases/tag/v26.0.0
https://github.com/wikimedia/mediawiki-tools-codesniffer/compare/25.0.0...v26.0.0

Disable failing Squiz.WhiteSpace.FunctionSpacing, can be fixed in a later
commit

Change-Id: I89062c8f28bef893f054650f2e81287291ba9ca0
Depends-On: I8f55e77283f83d853ce340f5c1b7704c65e45bc4