Upgrade the cactoos dependency to the latest version as they are incompatible now

[dgroup]

java.lang.NoClassDefFoundError: org/cactoos/io/LengthOf

	at com.jcabi.ssh.Ssh.session(Ssh.java:246)
	at com.jcabi.ssh.AbstractSshShell.exec(AbstractSshShell.java:95)
	at com.jcabi.ssh.Ssh.exec(Ssh.java:77)
	at com.jcabi.ssh.Shell$Plain.exec(Shell.java:241)

Latest version for now is 0.41.
The current version within jcabi-ssh is 0.16

[0crat]

@yegor256/z please, pay attention to this issue

[0crat]

@dgroup/z this project will fix the problem faster if you donate a few dollars to it; just click here and pay via Stripe, it's very fast, convenient and appreciated; thanks a lot!