Bump supervisor from 4.2.1 to 4.2.2 in /requirements

[dependabot]

Bumps supervisor from 4.2.1 to 4.2.2.

Changelog

Sourced from supervisor's changelog.

4.2.2 (2021-02-26)

• Fixed a bug where supervisord could crash if a subprocess exited immediately before trying to kill it.

• Fixed a bug where the stdout_syslog and stderr_syslog options of a [program:x] section could not be used unless file logging for the same program had also been configured. The file and syslog options can now be used independently. Patch by Scott Stroupe.

• Fixed a bug where the logfile option in the [supervisord] section would not log to syslog when the special filename of syslog was supplied, as is supported by all other log filename options. Patch by Franck Cuny.

• Fixed a bug where environment variables defined in environment= in the [supervisord] section or a [program:x] section could not be used in %(ENV_x)s expansions. Patch by MythRen.

• The supervisorctl signal command now allows a signal to be sent when a process is in the STOPPING state. Patch by Mike Gould.

• supervisorctl and supervisord now print help when given -? in addition to the existing -h/--help.

Commits

• 499fc10 Prepare 4.2.2 release
• 34ff60a Add tests for a5942666f28cd5956d22fdd3ef97e6bd188bb322
• a594266 extend expansions from user defined environments (#1227)
• 4e3f12e Correct environment= docs, add test for actual behavior
• 0c66c0c Handle race where process exits immediately in signal()
• d0026ae Print usage message on when given '-?'.
• ae60a73 Handle race where process exits immediately before killing it
• 36c9f82 Rewrite signal() tests to work like all the others
• ab8c724 Do not discard PID if sending a signal fails
• 5b1f3dc Guard against attempt to spawn process in UNKNOWN state
• Additional commits viewable in compare view

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[dependabot]

Superseded by #163.