Limit the maximum Maven Plug-in API version to be at most 3.6.4

[0x6675636b796f75676974687562]

What's done:

• Versions 3.7.0+ are incompatible.
• Fixes mvn plugin:descriptor@default-descriptor fails when performing a release #1632.

[codecov]

Codecov Report

Merging #1634 (4981711) into master (fceabd5) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1634   +/-   ##
=========================================
  Coverage     82.50%   82.50%           
  Complexity     2335     2335           
=========================================
  Files           112      112           
  Lines          7892     7892           
  Branches       2048     2048           
=========================================
  Hits           6511     6511           
  Misses          452      452           
  Partials        929      929           

Flag	Coverage Δ
unittests	82.50% <ø> (ø)

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[github-actions]

JUnit Tests (Windows, EnricoMi/publish-unit-test-result-action@v2)

   164 files   - 2     164 suites   - 2   16m 40s ⏱️ - 7m 48s
2 022 tests  - 4  2 006 ✔️  - 4  15 💤 ±0  0 ❌  - 1  1 🔥 +1 
2 022 runs   - 5  2 006 ✔️  - 5  15 💤 ±0  0 ❌  - 1  1 🔥 +1 

For more details on these errors, see this check.

Results for commit 4981711. ± Comparison against base commit 08c1eda.

This pull request removes 4 tests.

org.cqfn.diktat.plugin.maven.DiktatBaseMojoTest ‑ test default plugin configuration
org.cqfn.diktat.plugin.maven.DiktatBaseMojoTest ‑ test plugin custom configuration
org.cqfn.diktat.plugin.maven.DiktatMavenPluginIntegrationTest ‑ diktatCheck(TestInfo, MavenExecutionResult)
org.cqfn.diktat.plugin.maven.DiktatMavenPluginIntegrationTest ‑ diktatFix(TestInfo, MavenExecutionResult)

[github-actions]

JUnit Tests (macOS, EnricoMi/publish-unit-test-result-action@v2)

   166 files  ±0     166 suites  ±0   29m 10s ⏱️ + 1m 11s
2 026 tests ±0  1 988 ✔️ ±0  34 💤 ±0  4 ❌ ±0 
2 030 runs  ±0  1 992 ✔️ ±0  34 💤 ±0  4 ❌ ±0 

For more details on these failures, see this check.

Results for commit 4981711. ± Comparison against base commit 08c1eda.