Improved composer install script to default to latest stable

[AaronFeledy]

When install-composer.sh is called with no argument, it now runs the Composer installer without a version flag, defaulting to latest stable (currently Composer 2).

Previously, an empty argument would fall through to --version="" which could cause unexpected behavior.

This simplifies the workaround for corporate proxy environments where users can now run:

services:
  appserver:
    composer_version: false
    build_as_root:
      - # install certs here
      - /etc/lando/service/helpers/install-composer.sh

No version number needed.

Ref #236

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Note

Low Risk
Low risk: small shell-script control-flow change that only affects the no-argument/empty-version Composer install path.

Overview
Updates scripts/install-composer.sh so that when no composer_version (or an empty arg) is provided, it runs the Composer installer without --version, allowing it to default to the latest stable release instead of passing --version="".

Adds a changelog entry noting the improved default behavior.

^{Written by Cursor Bugbot for commit fbc1e78. This will update automatically on new commits. Configure here.}

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