Add a 6.1.4 section to the release notes

[Numpsy]

Description

As discussed in #2845 (comment)

Should I add an entry for #2843 at the same time?

[github-actions]

Test Results

  5 files   -   4    5 suites   - 4   6m 17s ⏱️ - 41m 42s
411 tests  -  32  410 ✅  -  33  0 💤 ±0  1 ❌ +1 
780 runs   - 483  779 ✅  - 484  0 💤 ±0  1 ❌ +1 

For more details on these failures, see this check.

Results for commit fcd283a. ± Comparison against base commit 78a2562.

This pull request removes 32 tests.

[Fake.DotNet.FxCop.Tests; Analysis failure is handled]
[Fake.DotNet.FxCop.Tests; Test errors are read as expected]
[Fake.DotNet.FxCop.Tests; Test full command line is created]
[Fake.DotNet.FxCop.Tests; Test process is created with working directory]
[Fake.DotNet.FxCop.Tests; Test process is created]
[Fake.DotNet.FxCop.Tests; Test project file update can be enabled]
[Fake.DotNet.FxCop.Tests; Test that Xsl is defaulted]
[Fake.DotNet.FxCop.Tests; Test that all arguments are processed as expected]
[Fake.DotNet.FxCop.Tests; Test that console output can be switched off]
[Fake.DotNet.FxCop.Tests; Test that default arguments are processed as expected (containing spaces)]
…