Bump lightning cloud for memory leak fix

[hhsecond]

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Fixes #<issue_number>

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[tchaton]

LGTM !

[codecov]

Codecov Report

Merging #14697 (973b719) into master (75e6c91) will increase coverage by 1%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #14697     +/-   ##
=========================================
+ Coverage      84%      85%     +1%     
=========================================
  Files         394      327     -67     
  Lines       28604    25859   -2745     
=========================================
- Hits        23894    21951   -1943     
+ Misses       4710     3908    -802