added missing import to dependencies (psutil)

[Sacek073]

Description

When I tried to run the pytest Unit tests for the first time, a lot of the tests failed because I didn't have installed psutil. Therefore I added it in the dependencies file.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Unit Tests
• Attached examples

Test Configuration:

• RFEM / RSTAB version: 6.04.0002
• Python version: 3.8.10

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[pull-request-quantifier-deprecated]

This PR has 5 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Quantification details

Label      : Extra Small
Size       : +3 -2
Percentile : 2%

Total files changed: 1

Change summary by file extension:
.py : +3 -2

Change counts above are quantified counts, based on the PullRequestQuantifier customizations.

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How to interpret the change counts in git diff output

• One line was added: +1 -0
• One line was deleted: +0 -1
• One line was modified: +1 -1 (git diff doesn't know about modified, it will
  interpret that line like one addition plus one deletion)
• Change percentiles: Change characteristics (addition, deletion, modification)
  of this PR in relation to all other PRs within the repository.

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