chore: set cron to run job every month instead of every week

.github/workflows/extract.yml

@@ -3,7 +3,7 @@ name: Extract
 on:
   workflow_dispatch:
   schedule:
-    - cron: '0 6 * * 6' # Runs every Saturday at 06:00 UTC
+    - cron: '0 6 1 * *' # Runs monthly on the 1st day at 06:00 UTC
 
 jobs:
   extract:
@@ -16,7 +16,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: 22
+          node-version-file: 'package.json'
       - uses: actions/setup-java@v4
         with:
           java-version: '21'

.github/workflows/publish.yml

@@ -17,7 +17,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
-          node-version: 22
+          node-version-file: 'package.json'
           registry-url: https://registry.npmjs.org/
       - run: npm install -g npm@latest
       - run: npm ci

README.md

@@ -2,7 +2,7 @@
 
 Utility for extracting credentials from the Crunchyroll Android app (both TV and mobile versions).
 
-The [credentials](https://github.com/vitalygashkov/crextractor/blob/main/credentials.tv.json) are [automatically](https://github.com/vitalygashkov/crextractor/actions/workflows/extract.yml) updated once a week (if there are any changes).
+The [credentials](https://github.com/vitalygashkov/crextractor/blob/main/credentials.tv.json) are [automatically](https://github.com/vitalygashkov/crextractor/actions/workflows/extract.yml) updated once a month (if there are any changes).
 
 ## Usage