SYN-5780: inet:ipv4 scrape finds hollywood IP addresses

[ghost]

• Update ipv4 regex to exclude matches with extra digits at the beginning/end or which are dotted number sequences longer than 4
• Update test

Resolves SYN-5780

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.11 ⚠️

Comparison is base (ddda6a9) 97.30% compared to head (55c3c17) 97.19%.

❗ Current head 55c3c17 differs from pull request most recent head 28223a7. Consider uploading reports for the commit 28223a7 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3234      +/-   ##
==========================================
- Coverage   97.30%   97.19%   -0.11%     
==========================================
  Files         225      225              
  Lines       45073    45054      -19     
==========================================
- Hits        43857    43789      -68     
- Misses       1216     1265      +49     

Flag	Coverage Δ
linux	97.19% <ø> (-0.01%)	⬇️
linux_replay	?

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Impacted Files	Coverage Δ
synapse/lib/scrape.py	99.30% <ø> (ø)

... and 11 files with indirect coverage changes

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