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mips: do not use $t0 temporary variable in dupio (#1776)

* mips: do not use $t0 temporary variable in dupio

dupio currently uses $t0 which is a temporary callee saved register.
The dup2 call is thus allowed to trash the register.
Use $v0 instead. $v0 is the return value register.
Either dup2 returns the provided $v0 (newfd) or -1 if it fails,
and therefore $v0 can be used safely here.

Reference:
 https://courses.cs.washington.edu/courses/cse410/09sp/examples/MIPSCallingConventionsSummary.pdf

* Update changelog

* Update dupio.asm

Make a small change to kick Github Actions

* Fix CHANGELOG

Co-authored-by: Heap Crash <66139157+heapcrash@users.noreply.github.com>
Co-authored-by: Arusekk <arek_koz@o2.pl>

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