[w3ctag/design-reviews] Editorial: change salutation (#209)

The en-GB variant doesn't seem very inclusive.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3ctag/design-reviews/pull/209

-- Commit Summary --

  * Editorial: change salutation

-- File Changes --

    M ISSUE_TEMPLATE.md (2)

-- Patch Links --

https://github.com/w3ctag/design-reviews/pull/209.patch
https://github.com/w3ctag/design-reviews/pull/209.diff

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