Chore: Add zarr to list of dependapot ignores

[melisande-c]

Description

Please provide a brief description of the changes in this PR. Include any relevant context or background information.

• What: Add zarr to list of dependapot ignores.
• Why: Our dependency on Zarr should match that of ome-zarr-py, they pin their dependency <3.
• How: Updated dependabot config file.

Related Issues

• Closes Make dependabot ignore zarr major version 4 #348

A new tracking issue has been opened: #374

---

Please ensure your PR meets the following requirements:

• Code builds and passes tests locally, including doctests
• New tests have been added (for bug fixes/features)
• Pre-commit passes
• PR to the documentation exists (for bug fixes / features)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.11%. Comparing base (b29fc6c) to head (0142f64).
Report is 34 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #375      +/-   ##
==========================================
+ Coverage   87.80%   89.11%   +1.31%     
==========================================
  Files         137      146       +9     
  Lines        4971     5110     +139     
==========================================
+ Hits         4365     4554     +189     
+ Misses        606      556      -50     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.