[deps] Update supervisor requirement from ~=4.2 to ~=4.3 in /images

[dependabot]

Updates the requirements on supervisor to permit the latest version.

Changelog

Sourced from supervisor's changelog.

4.3.0 (2025-08-23)

• Fixed a bug where the poller would not unregister a closed file descriptor under some circumstances, which caused excessive polling, resulting in higher CPU usage. Patch by aftersnow.

• Fixed a bug where restarting supervisord may have failed with the message Error: Another program is already listening on a port that one of our HTTP servers is configured to use. if an HTTP request was made during restart. Patch by Julien Le Cléach.

• Fixed a unit test that failed only on Python 3.13. Only test code was changed; no changes to supervisord itself. Patch by Colin Watson.

• On Python 3.8 and later, setuptools is no longer a runtime dependency. Patch by Ofek Lev.

• On Python versions before 3.8, setuptools is still a runtime dependency (for pkg_resources) but it is no longer declared in setup.py as such. This is because adding a conditional dependency with an environment marker (setuptools; python_version < '3.8') breaks installation in some scenarios, e.g. setup.py install or older versions of pip. Ensure that setuptools is installed if using Python before 3.8.

4.2.5 (2022-12-23)

• Fixed a bug where the XML-RPC method supervisor.startProcess() would return 500 Internal Server Error instead of an XML-RPC fault response if the command could not be parsed. Patch by Julien Le Cléach.

• Fixed a bug on Python 2.7 where a UnicodeDecodeError may have occurred when using the web interface. Patch by Vinay Sajip.

• Removed use of urllib.parse functions splithost, splitport, and splittype deprecated in Python 3.8.

• Removed use of asynchat and asyncore deprecated in Python 3.10.

• The return value of the XML-RPC method supervisor.getAllConfigInfo() now includes the directory, uid, and serverurl of the program. Patch by Yellmean.

• If a subprocess exits with a unexpected exit code (one not listed in exitcodes= in a [program:x] section) then the exit will now be logged at the WARN level instead of INFO. Patch by Precy Lee.

• supervisorctl shutdown now shows an error message if an argument is

... (truncated)

Commits

• dbca8d4 Prepare 4.3.0 release
• 362be27 Fix typo in changelog
• 746747e Fix typo in job name
• 5b2fc53 Remove deprecated tests_require= and test_suite=. Refs #1675
• 23145c2 Add notes to changelog and docs for installing on Python < 3.8
• f9c4c4f Only check for pkg_resources as only it is required
• 9a0a315 Raise on install if Python < 3.8 requirements are not met. Refs #1692
• 97dfb21 Add link to 'setup.py install' ticket
• 6d7ece2 Fix installation via "setup.py install"
• e47ce38 Remove use of discontinued Ubuntu 20.04 image
• Additional commits viewable in compare view

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[dependabot]

Looks like supervisor is up-to-date now, so this is no longer needed.