[FIX] change keyserver to ubuntu

[jdkent]

looks like the existing key-server is deprecated: https://sks-keyservers.net/

This changes the keyserver to the one suggested by neurodebian: https://neuro.debian.net/

[codecov-commenter]

Codecov Report

Merging #983 (165828b) into master (8511c4f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #983   +/-   ##
=======================================
  Coverage   78.58%   78.58%           
=======================================
  Files          63       63           
  Lines        3231     3231           
=======================================
  Hits         2539     2539           
  Misses        692      692           

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[cypress]

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Test summary

7 • 0 • 0 • 0 • 1

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Run details

Project	Neuroscout
Status	Passed
Commit	165828b
Started	Sep 21, 2021 10:31 PM
Ended	Sep 21, 2021 10:33 PM
Duration	01:42 💡
OS	Linux Ubuntu - 20.04
Browser	Electron 87

View run in Cypress Dashboard ➡️

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Flakiness

	cypress/integration/analysis_builder.spec.js		1
1	Analysis Builder > analysis builder

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[cypress]

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Test summary

6 • 1 • 0 • 0 • 0

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Run details

Project	Neuroscout
Status	Failed
Commit	0d510a0 ℹ️
Started	Sep 21, 2021 10:33 PM
Ended	Sep 21, 2021 10:35 PM
Duration	01:43 💡
OS	Linux Ubuntu - 20.04
Browser	Electron 87

View run in Cypress Dashboard ➡️

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Failures

	cypress/integration/analysis_builder.spec.js		1
1	Analysis Builder > analysis builder

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This comment has been generated by cypress-bot as a result of this project's GitHub integration settings. You can manage this integration in this project's settings in the Cypress Dashboard