Replace uses of `urllib.request` with `requests`

[jwodder]

Part of #325.

[codecov-commenter]

Codecov Report

Merging #359 (c3fe16c) into master (a4c1ba2) will increase coverage by 0.05%. The diff coverage is 55.00%.

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@@            Coverage Diff             @@
##           master     #359      +/-   ##
==========================================
+ Coverage   33.63%   33.68%   +0.05%     
==========================================
  Files          50       51       +1     
  Lines        7050     7062      +12     
  Branches     1781     1784       +3     
==========================================
+ Hits         2371     2379       +8     
- Misses       4500     4504       +4     
  Partials      179      179              

Impacted Files	Coverage Δ
src/nidm/experiment/Utils.py	27.26% <0.00%> (-0.10%)	:arrow_down:
src/nidm/experiment/tools/nidm2bids.py	0.00% <0.00%> (ø)
src/nidm/experiment/CDE.py	75.00% <100.00%> (ø)
src/nidm/experiment/Query.py	71.89% <100.00%> (ø)
src/nidm/util.py	100.00% <100.00%> (ø)

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[yarikoptic]

requests are already used, so I guess it does make sense to harmonize all http interactions through it. FWIW here is usage points:

src/nidm/experiment/Query.py:import requests
src/nidm/experiment/Query.py:            r2 = requests.post(
src/nidm/experiment/Query.py:            requests.post(
src/nidm/experiment/Utils.py:import requests
src/nidm/experiment/Utils.py:    response = requests.post(

Just need a conflict resolved first

[jwodder]

@yarikoptic Conflict resolved.

[github-actions[bot]]

:rocket: PR was released in v4.0.0 :rocket: