fix: Allow equals sign in sequenceDiagram labels

[ajuckel]

📑 Summary

Resolves the issue where equals sign was accidentally disallowed in sequence diagram participants.

Resolves #6171

📏 Design Decisions

Commit e852156 unintentionally changed an escaped hyphen in a regex character class to an escaped left-angle-bracket followed by an un-escaped hyphen. Rather than disallowing <, -, and >, this change inadvertently disallowed characters < through >. Nestled in between < and > in the ASCII characters is =.

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🦋 Changeset detected

Latest commit: 6cc1926

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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mermaid	Patch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 3.88%. Comparing base (bc2bd3d) to head (6cc1926).

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #6332   +/-   ##
=======================================
  Coverage     3.88%   3.88%           
=======================================
  Files          398     398           
  Lines        42044   42044           
  Branches       638     638           
=======================================
  Hits          1635    1635           
  Misses       40409   40409           

Flag	Coverage Δ
unit	3.88% <ø> (ø)

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Build	Status	Details	Updated (UTC)
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[fleon]

@sidharthv96 @ashishjain0512 Could either of you please take a look? Looks like a straightforward fix. This is one of the issues that will help us upgrade Mermaid from v10.x to v11.x easily in GitLab: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/171452

[ajuckel]

@sidharthv96 @ashishjain0512 I've added a changeset, rebased the change on top of latest develop, amended the commit message and PR title to coincide with the changeset. Is there anything else I can do to help get this reviewed and merged? Any concerns from your end that I should address?

Ideally, this PR and #6345 could be merged before the next release. I believe these two PRs would be sufficient to allow GitLab to more easily adopt the 11.x series.