compilation warnings with > 1.19: Converting the struct update syntax into type assertions

[ndrean]

Some minor compilation warnings as "Elixir should warn if you use the struct update syntax without pattern matching on the struct"

Protobuf.DSL.parse_field_opts_to_field_props
Protobuf.DSL.Protobuf.DSL.cal_json_name
Protobuf.Protoc.Generator.Extension.get_extensions_from_messages
Protobuf.DSL.cal_packed
Protobuf.Protoc.CLI.parse_param

defp parse_param("one_file_per_module=" <> value, %Context{} = ctx) do
                                                       ^^^
    case value do
      "true" ->
        %{ctx | one_file_per_module?: true}
      ^^^

Maybe update .github/worflows to catch this

jobs:
  test:
    name: Test (Elixir ${{ matrix.elixir }} | Erlang/OTP ${{ matrix.otp }})
    runs-on: ubuntu-22.04
    strategy:
      fail-fast: false
      matrix:
        include:
          ...
          - otp: 28.x
            elixir: 1.19.x

[nshkrdotcom]

Opened PR #427 with the Elixir 1.19 warning fixes (struct update syntax + preferred_cli_env move), plus cleanup of remaining test warnings and CI matrix update for 1.19/OTP 28. Please take a look: #427

[yordis]

@whatyouhide this one could be close now as far as I can tell