fix: keep newline at the end of the file in tools

As referenced in Jinja documentation about whitespace control:
<https://jinja.palletsprojects.com/en/3.1.x/templates/#whitespace-control>
>  To keep single trailing newlines, configure Jinja to
>  `keep_trailing_newline`
I added this to our Jinja environment to keep EOL new line in tools
scripts

RELEASE.md

@@ -0,0 +1,3 @@
+Release type: patch
+
+Keep the newline at the end of the file in generating tools scripts

pelican/tools/pelican_quickstart.py

@@ -44,6 +44,7 @@ _TEMPLATES_DIR = os.path.join(os.path.dirname(os.path.abspath(__file__)), "templ
 _jinja_env = Environment(
     loader=FileSystemLoader(_TEMPLATES_DIR),
     trim_blocks=True,
+    keep_trailing_newline=True,
 )