Update Dependabot schedule to run monthly

[Copilot]

Description

Updated Dependabot schedule from cron-based weekly runs to monthly cadence on first Monday at 8:00 AM EST.

Changes:

• Replaced interval: 'cron' + cronjob: '0 9 * * 1' with interval: "monthly" + day: "monday" + time: "08:00"
• All other configuration (grouping, ignores, labels) unchanged

Before:

schedule:
  interval: 'cron'
  cronjob: '0 9 * * 1'
  timezone: 'US/Eastern'

After:

schedule:
  interval: "monthly"
  day: "monday"
  time: "08:00"
  timezone: "US/Eastern"

Related Issue

N/A

Motivation and Context

Reduces Dependabot run frequency from weekly to monthly to decrease PR volume while maintaining regular dependency updates.

How Has This Been Tested?

YAML syntax validated. Dependabot will run on next scheduled monthly Monday.

Screenshots (if appropriate):

N/A

Original prompt

Update dependabot to run monthly with this: schedule:
interval: "monthly"
day: "monday"
time: "08:00"
timezone: "US/Eastern"

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.59%. Comparing base (67c4cdf) to head (3a96ab9).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #449   +/-   ##
=======================================
  Coverage   99.59%   99.59%           
=======================================
  Files          51       51           
  Lines         995      995           
  Branches      344      344           
=======================================
  Hits          991      991           
  Misses          4        4           

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[Copilot]

Pull request overview

This pull request updates the Dependabot schedule configuration to reduce the frequency of dependency update checks from weekly to monthly, running on the first Monday of each month at 8:00 AM Eastern time.

Changes:

• Replaced cron-based weekly schedule with simplified monthly schedule configuration
• Changed run time from 9:00 AM to 8:00 AM Eastern time

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