davis: 4.4.1 -> 4.4.2

[Ramblurr]

Description of changes

Release notes: https://github.com/tchapi/davis/releases/tag/v4.4.2

davis package:

• Our patchset is no longer required (see Allow setting Symfony's dotenv path tchapi/davis#156), so I've removed it
• I also removed the composer.lock file from the package because I learned that php.buildComposerProject will use the one in the fetched repo.

nixos/davis module:

• Though the upstream var names changed, so we had to update those too
• These vars are managed by the nixos module and hence are not breaking
  changes for users of the module.
• Also removed need to specify postgres charset in non-standard way
  (see Postgresql fails due to use of utf8mb4 default encoding tchapi/davis#153)

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/)
• 24.05 Release Notes (or backporting 23.05 and 23.11 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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