Beets: allow installing minimal version on legacy systems, fix dependencies

[barracuda156]

Description

See commits.

Likely this is not gonna pass CI, since it requires a lot of ports, and uses python310.

Type(s)

• bugfix
• enhancement
• security fix

Tested on

macOS 10.6
Xcode 3.2

Verification

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• checked that there aren't other open pull requests for the same change?
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• tried existing tests with sudo port test?
• tried a full install with sudo port -vst install?
• tested basic functionality of all binary files?
• checked that the Portfile's most important variants haven't been broken?

[barracuda156]

@reneeotten I am dropping py38 subport from py-py7zr, since it breaks CI due to some dependencies not building or not existing anymore. This is a nomaintainer port with no dependents for py38 version.

[reneeotten]

can you please rebase with master so we can see if the CI (or at least as much as possible) - right now it fails immediately with a parse error, which I assume has been resolved by now.

[barracuda156]

can you please rebase with master so we can see if the CI (or at least as much as possible) - right now it fails immediately with a parse error, which I assume has been resolved by now.

Done

[barracuda156]

Ok, now it is just a missing dep in a subport:

  ERROR Missing dependencies:
  	build
  	importlib-metadata>=4.6
  Command failed:  cd "/opt/local/var/macports/build/_Users_runner_work_macports-ports_macports-ports_ports_python_py-py7zr/py39-py7zr/work/py7zr-0.22.0" && /opt/local/Library/Frameworks/Python.framework/Versions/3.9/bin/python3.9 -m build --no-isolation --wheel --outdir /opt/local/var/macports/build/_Users_runner_work_macports-ports_macports-ports_ports_python_py-py7zr/py39-py7zr/work 
  Error: Failed to build py39-py7zr: command execution failed
  DEBUG: Error code: CHILDSTATUS 93131 1
  DEBUG: Backtrace: command execution failed
      while executing
  "system {*}$notty {*}$callback {*}$nice $fullcmdstring"
      invoked from within
  "command_exec -callback portprogress::target_progress_callback build"
      (procedure "portbuild::build_main" line 10)
      invoked from within
  "$procedure $targetname"
  Exit code: 1
  Error: See /opt/local/var/macports/logs/_Users_runner_work_macports-ports_macports-ports_ports_python_py-py7zr/py39-py7zr/main.log for details.
  Error: Follow https://guide.macports.org/#project.tickets if you believe there is a bug.
  Error: Processing of port py39-py7zr failed
  Build of 'py39-py7zr' failed.