Disable mamba on Azure Pipelines

[epassaro]

Description

Fix #1958

Motivation and context

mamba seems broken, couldn't find any issues opened in mamba repo (yet).

How has this been tested?

• Testing pipeline.
• Other.

Examples

Type of change

• Bug fix.
• New feature.
• Breaking change.
• None of the above.

Checklist

• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
  • (optional) I have built the documentation on my fork following the instructions.
• I have assigned and requested two reviewers for this pull request.

[tardis-bot]

Before a pull request is accepted, it must meet the following criteria:

• Is the necessary information provided?
• Is this a duplicate PR?
  • If a new PR is clearly a duplicate, ask how this PR is different from the original PR?
  • If this PR is about to be merged, close the original PR with a link to this new PR that solved the issue.
• Does it pass existing tests and are new tests provided if required?
  • The test coverage should not decrease, and for new features should be close to 100%.
• Is the code tidy?
  • No unnecessary print lines or code comments.

[andrewfullard]

Can you raise the issue in the mamba repo?

[epassaro]

Can you raise the issue in the mamba repo?

I'll try to do that later today.

[codecov]

Codecov Report

Merging #1959 (dc525e3) into master (929b0ec) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1959   +/-   ##
=======================================
  Coverage   58.80%   58.80%           
=======================================
  Files          70       70           
  Lines        7853     7853           
=======================================
  Hits         4618     4618           
  Misses       3235     3235           

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