Add 1 git-crypt collaborator

[nittagr]

New collaborators:

4F1A8997 Michael Clancy <michael.clancy@digital.justice.gov.uk>

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Describe what you did and why.

Checklist

Before you ask people to review this PR:

• Tests should be passing: ./gradlew test
• Github should not be reporting conflicts; you should have recently run git rebase main.
• Avoid mixing whitespace changes with code changes in the same commit. These make diffs harder to read and conflicts more likely.
• You should have looked at the diff against main and ensured that nothing unexpected is included in your changes.
• You should have checked that the commit messages say why the change was made.