pyamlboot.tests: fix the eval

[trofi]

Without the change the eval fails as:

$ nix build --no-link -f. pyamlboot.tests
error:
   … while evaluating the attribute 'version'
     at pkgs/by-name/py/pyamlboot/package.nix:29:3:
       28|
       29|   passthru.tests.version = testers.testVersion {
         |   ^
       30|     package = "pyamlboot";

   … while evaluating the 'name' attribute of a derivation

   … while evaluating a branch condition
     at lib/strings.nix:2627:3:
     2626|   # First detect the common case of already valid strings, to speed those up
     2627|   if stringLength string <= 207 && okRegex string != null
         |   ^
     2628|   then unsafeDiscardStringContext string

   (stack trace truncated; use '--show-trace' to show the full, detailed trace)

   error: expected a set but found a string: "pyamlboot"

After fixing the eval tests started failing as --version hardcodes 1.0.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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