make sure to filter created_utc to be less than 4 hours from now

[peterdudfield]

Pull Request

Description

add filter on created time also

Fixes #

How Has This Been Tested?

normal CI, could add an extra test, but havent

• [ ] Yes

Checklist:

• [ ] My code follows OCF's coding style guidelines
• [ ] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have checked my code and corrected any misspellings

[codecov-commenter]

Codecov Report

Merging #107 (ba835f6) into main (c479588) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #107   +/-   ##
=======================================
  Coverage   98.19%   98.19%           
=======================================
  Files          19       19           
  Lines         943      944    +1     
=======================================
+ Hits          926      927    +1     
  Misses         17       17           

Impacted Files	Coverage Δ
nowcasting_datamodel/read/read.py	97.54% <100.00%> (+0.01%)	:arrow_up:

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