jtcop: Fix problems with tests

[volodya-lombrozo]

We cannot upgrade the jtcop-maven-plugin because some of our tests doesn't correspond to the code quality requirements. Thus, I believe we have to fix all problems with jtcop-maven-plugin and upgrade the plugin version.

Failed PR (upgrade jtcop-maven-plugin): #1993
Failed pipeline: https://github.com/objectionary/eo/actions/runs/5125427588/jobs/9218584948?pr=1993

[0pdd]

@volodya-lombrozo 3 puzzles #2146, #2147, #2148 are still not solved.

[0pdd]

@volodya-lombrozo 2 puzzles #2146, #2148 are still not solved; solved: #2147.

[0pdd]

@volodya-lombrozo 2 puzzles #2148, #2171 are still not solved; solved: #2146, #2147.

[0pdd]

@volodya-lombrozo the puzzle #2171 is still not solved; solved: #2146, #2147, #2148.

[0pdd]

@volodya-lombrozo the puzzle #2297 is still not solved; solved: #2146, #2147, #2148, #2171.

[0pdd]

@volodya-lombrozo 3 puzzles #3130, #3131, #3132 are still not solved; solved: #2146, #2147, #2148, #2171, #2297.