Remove stray newline after python-build installation

[tklauser]

This makes the output look slightly odd:

$ pyenv install 3.10.9
python-build: use openssl@1.1 from homebrew
python-build: use readline from homebrew
Downloading Python-3.10.9.tar.xz...
-> https://www.python.org/ftp/python/3.10.9/Python-3.10.9.tar.xz
Installing Python-3.10.9...
python-build: use readline from homebrew
python-build: use zlib from xcode sdk
Installed Python-3.10.9 to /Users/tklauser/.pyenv/versions/3.10.9

$

Remove the stray newline to match other pyenv commands.

Make sure you have checked all steps below.

Prerequisite

• Please consider implementing the feature as a hook script or plugin as a first step.
  • pyenv has some powerful support for plugins and hook scripts. Please refer to Authoring plugins for details and try to implement it as a plugin if possible.
• Please consider contributing the patch upstream to rbenv, since we have borrowed most of the code from that project.
  • We occasionally import the changes from rbenv. In general, you can expect changes made in rbenv will be imported to pyenv too, eventually.
  • Generally speaking, we prefer not to make changes in the core in order to keep compatibility with rbenv.
• My PR addresses the following pyenv issue (if any)
  • None

Description

• Here are some details about my PR
  • Fixes a stray newline at the end of pyenv install ... when installing using python-build.

Tests

• My PR adds the following unit tests (if any)
  • None