Add "pin" to password-word-equivalents (Bug#35523)
* lisp/international/mule-conf.el (password-word-equivalents): Add "pin". * test/lisp/comint-tests.el (comint-testsuite-password-strings): Add test case.
* lisp/international/mule-conf.el (password-word-equivalents): Add "pin". * test/lisp/comint-tests.el (comint-testsuite-password-strings): Add test case.