New key breaks r docker container build

[danielStrobl]

A new key for the R repo (see https://cloud.r-project.org/) breaks building the R container.
This PR fixes that.

Submission type

• This submission adds a new dataset
• This submission adds a new method
• This submission adds a new metric
• This submission adds a new task
• This submission adds a new Docker image
• This submission fixes a bug (link to related issue: )
• This submission adds a new feature not listed above

[codecov-commenter]

Codecov Report

Merging #322 (3a9524f) into main (4394dbb) will decrease coverage by 0.18%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #322      +/-   ##
==========================================
- Coverage   89.30%   89.11%   -0.19%     
==========================================
  Files          73       73              
  Lines        1533     1498      -35     
  Branches       90       90              
==========================================
- Hits         1369     1335      -34     
+ Misses        135      134       -1     
  Partials       29       29              

Flag	Coverage Δ
unittests	89.11% <ø> (-0.19%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...s/tasks/multimodal_data_integration/metrics/mse.py	81.25% <0.00%> (-1.11%)	⬇️
openproblems/patch.py	96.87% <0.00%> (-0.19%)	⬇️
openproblems/data/utils.py	96.42% <0.00%> (-0.07%)	⬇️
openproblems/tools/normalize.py	100.00% <0.00%> (ø)
openproblems/tools/decorators.py	100.00% <0.00%> (ø)
openproblems/tasks/denoising/metrics/mse.py	100.00% <0.00%> (ø)
openproblems/tasks/denoising/methods/alra.py	0.00% <0.00%> (ø)
openproblems/tasks/denoising/methods/magic.py	100.00% <0.00%> (ø)
openproblems/tasks/denoising/metrics/poisson.py	100.00% <0.00%> (ø)
openproblems/tasks/label_projection/metrics/f1.py	100.00% <0.00%> (ø)
... and 11 more

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[scottgigante-immunai]

LGTM, but why do we need to change the R version here?

[danielStrobl]

I couldn't find an official repository that still contains R 4.0, the old one is not available anymore. Not sure what the policy for additional packages was, should they be added to the r-extras container or to a new, separate container? The first case wouldn't work anymore as the old package does no longer exist.

[scottgigante-immunai]

That makes sense. Thanks!