Update CI to use ubuntu 20.04 and include py 3.10

[aragilar]

bors r+

[bors[bot]]

Build failed:

• aragilar.pytest-mpi

[aragilar]

bors r+

[codecov[bot]]

Codecov Report

Merging #37 (3bbbd99) into master (9ad369a) will decrease coverage by 0.80%. The diff coverage is n/a.

@@             Coverage Diff             @@
##            master      #37      +/-   ##
===========================================
- Coverage   100.00%   99.19%   -0.81%     
===========================================
  Files            3        3              
  Lines          124      124              
===========================================
- Hits           124      123       -1     
- Misses           0        1       +1     

Impacted Files	Coverage Δ
src/pytest_mpi/__init__.py	99.10% <0.00%> (-0.90%)	:arrow_down:

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[bors[bot]]

Canceled.

[aragilar]

bors r+

[bors[bot]]

Build failed:

• aragilar.pytest-mpi

[aragilar]

bors r+

[bors[bot]]

Build failed:

• aragilar.pytest-mpi

[aragilar]

bors r+

[bors[bot]]

Build succeeded:

• aragilar.pytest-mpi
• codecov/patch
• codecov/project