Loosen p7zip_jll compatibility

[omus]

Addresses a compat issue that only happens on older versions of Julia (1.7) when using the undocumented force_latest_compatible_version flag for Pkg.test:

julia> Pkg.test(; allow_reresolve=true, force_latest_compatible_version=true)
     Testing TimeZones
┌ Warning: Could not use exact versions of packages in manifest, re-resolving
└ @ Pkg.Operations /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.7/Pkg/src/Operations.jl:1488
ERROR: Unsatisfiable requirements detected for package p7zip_jll [3f19e933]:
 p7zip_jll [3f19e933] log:
 ├─possible versions are: 16.2.1 or uninstalled
 └─restricted to versions 17 by TimeZones [f269a46b] — no versions left
   └─TimeZones [f269a46b] log:
     ├─possible versions are: 1.20.0 or uninstalled
     └─TimeZones [f269a46b] is fixed to version 1.20.0

Originally, I encountered this failure when working on an update to Registrator.jl: JuliaRegistries/Registrator.jl#445

Registrator.jl issue

 ┌ Warning: Could not use exact versions of packages in manifest, re-resolving
└ @ Pkg.Operations /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.7/Pkg/src/Operations.jl:1488
ERROR: LoadError: Unsatisfiable requirements detected for package TimeZones [f269a46b]:
 TimeZones [f269a46b] log:
 ├─possible versions are: 0.7.3-1.21.0 or uninstalled
 ├─restricted by compatibility requirements with Mocking [78c3b35d] to versions: 1.18.0-1.21.0 or uninstalled
 │ └─Mocking [78c3b35d] log:
 │   ├─possible versions are: 0.5.6-0.8.1 or uninstalled
 │   ├─restricted to versions 0.7-0.8 by Registrator [4418983a], leaving only versions 0.7.0-0.8.1
 │   │ └─Registrator [4418983a] log:
 │   │   ├─possible versions are: 1.9.3 or uninstalled
 │   │   └─Registrator [4418983a] is fixed to version 1.9.3
 │   └─restricted to versions 0.8 by an explicit requirement, leaving only versions 0.8.0-0.8.1
 ├─restricted by compatibility requirements with GitForge [8f6bce27] to versions: 1.0.0-1.21.0, leaving only versions: 1.18.0-1.21.0
 │ └─GitForge [8f6bce27] log:
 │   ├─possible versions are: 0.1.0-0.4.2 or uninstalled
 │   └─restricted to versions 0.4 by Registrator [4418983a], leaving only versions 0.4.0-0.4.2
 │     └─Registrator [4418983a] log: see above
 └─restricted by compatibility requirements with p7zip_jll [3f19e933] to versions: 0.7.3-1.11.0 or uninstalled — no versions left
   └─p7zip_jll [3f19e933] log:
     ├─possible versions are: 16.2.1 or uninstalled
     └─restricted by compatibility requirements with Pkg [44cfe95a] to versions: 16.2.1
       └─Pkg [44cfe95a] log:
         ├─possible versions are: 1.7.0 or uninstalled
         └─restricted to versions 1 by Registrator [4418983a], leaving only versions 1.7.0
           └─Registrator [4418983a] log: see above

– https://github.com/JuliaRegistries/Registrator.jl/actions/runs/13138017302/job/36657983996?pr=445#step:6:20

[omus]

The new CI job does catch the issue and is the only job to do so