[MRO] update Node version

[BenoitZugmeyer]

This updates Node to the same version we are using internally.

[bcaudan]

We should also update dockerfile in order to run gitlab jobs on this version as well

[codecov-io]

Codecov Report

Merging #263 into master will decrease coverage by 0.68%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #263      +/-   ##
==========================================
- Coverage   85.86%   85.18%   -0.69%     
==========================================
  Files          24       24              
  Lines        1323     1323              
  Branches      276      276              
==========================================
- Hits         1136     1127       -9     
- Misses        187      196       +9

Impacted Files	Coverage Δ
packages/core/src/requestCollection.ts	82.69% <0%> (-13.47%)	⬇️
packages/logs/src/loggerSession.ts	95.45% <0%> (-4.55%)	⬇️
packages/rum/src/rum.entry.ts	69.38% <0%> (-2.05%)	⬇️

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