fix: update data download URL to use GitHub Releases with prefix

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: dr5hn

.github/workflows/update-data.yml

@@ -32,7 +32,7 @@ jobs:
 
       - name: Download latest data
         run: |
-          curl -L "https://raw.githubusercontent.com/dr5hn/countries-states-cities-database/refs/heads/master/json/countries%2Bstates%2Bcities.json.gz" \
+          curl -L "https://github.com/dr5hn/countries-states-cities-database/releases/latest/download/json-countries%2Bstates%2Bcities.json.gz" \
             -o /tmp/countries-data.json.gz
           gunzip /tmp/countries-data.json.gz
           echo "Downloaded data size:"

CONTRIBUTING.md

@@ -150,7 +150,7 @@ To update the timezone data from the source:
 
 ```bash
 # Download latest data
-curl -L "https://raw.githubusercontent.com/dr5hn/countries-states-cities-database/refs/heads/master/json/countries%2Bstates%2Bcities.json.gz" \
+curl -L "https://github.com/dr5hn/countries-states-cities-database/releases/latest/download/json-countries%2Bstates%2Bcities.json.gz" \
   -o /tmp/countries-data.json.gz
 gunzip /tmp/countries-data.json.gz