Fix conf.py syntax error

Author: cmacfarl

docs/source/conf.py

@@ -275,9 +275,9 @@
     },
 }
 
-linkcheck_allowed_redirects = [
+linkcheck_allowed_redirects = {
     r'https://ftc-docs\.firstinspires\.org/.*': r'https://ftc-docs\.firstinspires\.org/en/latest/.*'
-]
+}
 
 # Firstinspires redirects to login and break our link checker :)
 # ftc-ml.firstinspires.org does a redirect that linkcheck hates.