fix: version reported by srt --version

[MarlzRana]

The version reported by srt --version is incorrect.

This makes the brew formula look peculiar (see the test):

class SandboxRuntime < Formula
  desc "Lightweight sandboxing tool for filesystem and network restrictions"
  homepage "https://github.com/anthropic-experimental/sandbox-runtime"
  url "https://registry.npmjs.org/@anthropic-ai/sandbox-runtime/-/sandbox-runtime-0.0.37.tgz"
  sha256 "0ee00dbedeeb05c46e6c320d3d33de444cbafa2dd3345cafc15b06f549f65fa0"
  license "Apache-2.0"

  depends_on "node"

  on_linux do
    depends_on "bubblewrap"
  end

  def install
    system "npm", "install", *std_npm_args
    bin.install_symlink libexec.glob("bin/*")
  end

  test do
    assert_match "1.0.0", shell_output("#{bin}/srt --version")
    assert_match "Run commands in a sandbox", shell_output("#{bin}/srt --help")
  end
end

Let's fix that! 😄

Fixes issue: #119

[MarlzRana]

process.env.npm_package_version is null when you do not invoke it via npm (e.g srt echo "Hello world!").

[sysid]

@Mainainers, this is an annoying inconsistency with a simple fix. Please merge.