Upgrade haml_lint Gem to 0.26.0

This is the same as https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/13304.

What does this MR do?

Upgrade the haml_lint Gem to use the latest version (0.26.0).

Why was this MR needed?

To have support for disabling linters with comments. (https://github.com/brigade/haml-lint/commit/0e3a25cfc42e79b4b6d3d6ab7af2367fe1fa2ba1#diff-04c6e90faac2675aa89e2176d2eec7d8R147)

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/34903

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9742#note_28099787

This requires https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12741 to be in EE. I'm not sure if it is a good idea to cherry pick that into this merge request.

added blocked label

@DouweM do you see any way to solve this other than waiting for the CE → EE merge to finish?

/cc @timzallmann

Uhm... it looks like https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12741 is not necessary

The failing build seems unrelated. passed after another rebase.

removed blocked label

assigned to @DouweM

added 21 commits

• c777b5a4...6b2fde7e - 19 commits from branch master
• 64e9b425 - Upgrade haml_lint Gem to 0.26.0
• 1e63489a - Disable new rules in haml_lint

Compare with previous version

Failing test looks like https://gitlab.com/gitlab-org/gitlab-ce/issues/35985 passed after another rebase.

approved this merge request

merged

mentioned in commit 194f0db6