Prevent Open311 updates from being sent out of order

[nephila-nacrea]

Please check the following:

• Has the code POD documentation been added or updated?
• Whether this PR should include changes to any public documentation, or the FAQ;
• All cobrand-specific commits start their commit message with the cobrand in square brackets;
• Is new functionality tested? CodeCov will warn you about the diff coverage, but won’t complain about e.g. new files;
• Will cobrand-specific changes require additional work to ensure consistent behaviour on www.fixmystreet.com?
• Are the changes tested for accessibility?
• Have you updated the changelog? If this is not necessary, put square brackets around this: skip changelog

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.42%. Comparing base (fbbc68c) to head (6e4d1f2).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5298      +/-   ##
==========================================
- Coverage   82.42%   82.42%   -0.01%     
==========================================
  Files         415      415              
  Lines       32837    32842       +5     
  Branches     5265     5266       +1     
==========================================
+ Hits        27065    27069       +4     
- Misses       4216     4217       +1     
  Partials     1556     1556              

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