Revert scheduled dependency update changes from the release pipeline

[Copilot]

This rolls back the pipeline changes introduced today in the release workflow. The release pipeline returns to the prior push-only Release Please flow and no longer opens scheduled/manual dependency update PRs.

• Release workflow revert

  • Restore .github/workflows/release-please.yml to its pre-change state
  • Keep the existing Release Please + NuGet publish path intact

• Removed pipeline behavior

  • Remove the scheduled cron trigger
  • Remove the workflow_dispatch trigger
  • Remove the update-dependencies job and its PR creation flow

• Resulting workflow shape

  • release-please runs only on pushes to main
  • publish-nuget remains driven by Release Please output

on:
  push:
    branches:
      - main

jobs:
  release-please:
    runs-on: ubuntu-latest

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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