Fix #2888 -- Apply ruff and pyupgrade to templates

pelican/tools/templates/pelicanconf.py.jinja2

@@ -1,8 +1,8 @@
 AUTHOR = {{author}}
 SITENAME = {{sitename}}
-SITEURL = ''
+SITEURL = ""
 
-PATH = 'content'
+PATH = "content"
 
 TIMEZONE = {{timezone}}
 
@@ -16,16 +16,20 @@ AUTHOR_FEED_ATOM = None
 AUTHOR_FEED_RSS = None
 
 # Blogroll
-LINKS = (('Pelican', 'https://getpelican.com/'),
-         ('Python.org', 'https://www.python.org/'),
-         ('Jinja2', 'https://palletsprojects.com/p/jinja/'),
-         ('You can modify those links in your config file', '#'),)
+LINKS = (
+    ("Pelican", "https://getpelican.com/"),
+    ("Python.org", "https://www.python.org/"),
+    ("Jinja2", "https://palletsprojects.com/p/jinja/"),
+    ("You can modify those links in your config file", "#"),
+)
 
 # Social widget
-SOCIAL = (('You can add links in your config file', '#'),
-          ('Another social link', '#'),)
+SOCIAL = (
+    ("You can add links in your config file", "#"),
+    ("Another social link", "#"),
+)
 
 DEFAULT_PAGINATION = {{default_pagination}}
 
 # Uncomment following line if you want document-relative URLs when developing
-#RELATIVE_URLS = True
+# RELATIVE_URLS = True