Bump the testing group with 1 update

[dependabot]

Updated Verify.NUnit from 31.19.0 to 31.20.0.

Release notes

Sourced from Verify.NUnit's releases.

31.20.0

• #​1755 Add TempDirectory + string operator for combining paths
• #​1756 TUnit 1.56.0
• #​1757 Expecto 11.1.0

31.19.1

• #​1746 Mark passthrough string Verify overloads as [StringSyntax("*")]

Commits viewable in compare view.

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot show <dependency name> ignore conditions will show all of the ignore conditions of the specified dependency
• @dependabot ignore <dependency name> major version will close this group update PR and stop Dependabot creating any more for the specific dependency's major version (unless you unignore this specific dependency's major version or upgrade to it yourself)
• @dependabot ignore <dependency name> minor version will close this group update PR and stop Dependabot creating any more for the specific dependency's minor version (unless you unignore this specific dependency's minor version or upgrade to it yourself)
• @dependabot ignore <dependency name> will close this group update PR and stop Dependabot creating any more for the specific dependency (unless you unignore this specific dependency or upgrade to it yourself)
• @dependabot unignore <dependency name> will remove all of the ignore conditions of the specified dependency
• @dependabot unignore <dependency name> <ignore condition> will remove the ignore condition of the specified dependency and ignore conditions

---

Summary by cubic

Upgrade Verify.NUnit from 31.19.0 to 31.20.0 to keep test tooling current. Picks up the new TempDirectory + string path-combining operator and updated test runner integrations.

^{Written for commit a91d579. Summary will update on new commits.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.65%. Comparing base (4b67990) to head (a91d579).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #115      +/-   ##
==========================================
- Coverage   65.66%   65.65%   -0.01%     
==========================================
  Files         337      337              
  Lines       30420    30420              
  Branches     5710     5710              
==========================================
- Hits        19974    19972       -2     
+ Misses       9031     9029       -2     
- Partials     1415     1419       +4     

Flag	Coverage Δ
unittests	65.65% <ø> (-0.01%)	⬇️

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

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.