Bump node from 16.0.0 to 20.6.0 in /backend

[dependabot[bot]]

Bumps node from 16.0.0 to 20.6.0.

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Name	Status	Preview	Comments	Updated (UTC)
life-after-hate	❌ Failed (Inspect)			Sep 6, 2023 11:27am

[codecov[bot]]

Codecov Report

Merging #1405 (85a67df) into master (18bc5cb) will decrease coverage by 7.97%. Report is 10 commits behind head on master. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1405      +/-   ##
==========================================
- Coverage   93.58%   85.62%   -7.97%     
==========================================
  Files          92       19      -73     
  Lines        1123      306     -817     
  Branches       65        0      -65     
==========================================
- Hits         1051      262     -789     
+ Misses         62       44      -18     
+ Partials       10        0      -10     

see 80 files with indirect coverage changes

[dependabot[bot]]

Superseded by #1407.