Fixing import for binder

[isaacgsmith]

Motivation and context

The way we imported scipy.sparse.linalg in tardis/montecarlo/montecarlo_numba/formal_integral.py caused errors in binder.

How has this been tested?

• Testing pipeline.
• Other.
  Tested on binder, see below.

Examples

https://hub.gke2.mybinder.org/user/smithis7-tardis-hsplhrfd/lab/tree/docs/quickstart/quickstart.ipynb

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.

[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]

Needs rebasing

[codecov]

Codecov Report

Merging #1808 (8dbb1df) into master (c1b5077) will increase coverage by 0.00%.
The diff coverage is n/a.

❗ Current head 8dbb1df differs from pull request most recent head e208a3e. Consider uploading reports for the commit e208a3e to get more accurate results

@@           Coverage Diff           @@
##           master    #1808   +/-   ##
=======================================
  Coverage   58.38%   58.39%           
=======================================
  Files          66       66           
  Lines        6705     6706    +1     
=======================================
+ Hits         3915     3916    +1     
  Misses       2790     2790           

Impacted Files	Coverage Δ
...dis/montecarlo/montecarlo_numba/formal_integral.py	50.00% <0.00%> (+0.17%)	⬆️

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[Rodot-]

Looks good to merge