Bump stmux from 1.8.4 to 1.8.7

[dependabot[bot]]

Bumps stmux from 1.8.4 to 1.8.7.

Commits

• 0e9eb23 release version 1.8.7
• 4f6da5c upgrade dependencies
• 551ec06 release version 1.8.6
• 23b12a7 fix style
• 4fecb5a terminate more cleanly (thanks to @​jacobbubu for indirect hint)
• 9a8c8c2 bump year in all copyright messages
• f5c914d upgrade dependencies
• 999d01d bump year in all copyright messages
• 0882c2a release version 1.8.5
• 31487a5 upgrade dependencies
• See full diff in compare view

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