Update dependency terminado to v0.12.1

This MR contains the following updates:

Package	Type	Update	Change
terminado	ironbank-pypi	minor	0.11.1 -> 0.12.1

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Release Notes

jupyter/terminado

v0.12.1

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Bugs fixed

• Revert "only override TERM if its not previously set" #​119 (@​rvalieris)

Contributors to this release

(GitHub contributors page for this release)

@​rvalieris

v0.12.0

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Bugs fixed

• correctly set the TERM variable #​117 (@​rvalieris)

Maintenance and upkeep improvements

• Replace deprecated unittest aliases #​116 (@​hugovk)

Contributors to this release

(GitHub contributors page for this release)

@​hugovk | @​rvalieris

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