v261

• Added support for configuring the Python version using a .python-version file. Both the 3.N and 3.N.N version forms are supported (the former is recommended). The existing runtime.txt file will take precedence if both files are found, however, we recommend switching to .python-version since it is more commonly supported in the Python ecosystem. (#1664)
• Added support for specifying only the Python major version in runtime.txt instead of requiring the full Python version (for example python-3.N instead of python-3.N.N). (#1664)