Get rid of Node 6 support

[Connormiha]

Summary

Nodejs team stop support of node 6 since 30 april.
I propose to remove support for node 6.
Many projects have already removed support of this version. For example Angular, Webpack 5 alpha, ts-loader.

Also i removed polyfill for v8.serialize because it supports since node 8

Test plan

[SimenB]

I like it! @scotthovestadt are we gonna make any more 24 releases, or can we start breaking things?

[codecov-io]

Codecov Report

Merging #8455 into master will decrease coverage by 0.08%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #8455      +/-   ##
==========================================
- Coverage   63.46%   63.38%   -0.09%     
==========================================
  Files         274      274              
  Lines       11385    11341      -44     
  Branches     2771     2760      -11     
==========================================
- Hits         7226     7188      -38     
+ Misses       3546     3541       -5     
+ Partials      613      612       -1

Impacted Files	Coverage Δ
packages/jest-util/src/deepCyclicCopy.ts	100% <ø> (+17.64%)	⬆️
packages/jest-serializer/src/index.ts	100% <100%> (ø)	⬆️

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[SimenB]

Can you update @babel/preset-env target as well?

https://github.com/facebook/jest/blob/f4c6e318a360048982e89439c1329e8fc6b857de/babel.config.js#L31

[SimenB]

Two failing snapshots due to changed stack trace (removed async await transpilation, I guess). Mind updating them? 🙂

[Connormiha]

@SimenB Done

[merlinnot]

One of the CI steps is failing as the process runs out of memory. As far as I can see there's 4096 MBs available in CircleCI, so we can bump it a little: NODE_OPTIONS=--max_old_space_size=4096. Obviously there are some other processes and the operating system consuming some memory too, so we'll never reach 4096, but this setting will allow all remaining memory to be consumed.

[Connormiha]

One of the CI steps is failing as the process runs out of memory. As far as I can see there's 4096 MBs available in CircleCI, so we can bump it a little: NODE_OPTIONS=--max_old_space_size=4096. Obviously there are some other processes and the operating system consuming some memory too, so we'll never reach 4096, but this setting will allow all remaining memory to be consumed.

This test fails on master for a long time.

[github-actions]

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