Alter dependabot.yml for nuget central package management

[alexaka1]

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[changeset-bot]

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Latest commit: 72c1cc5

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

Platform: macos-latest

Package	Line Rate	Branch Rate	Complexity	Health
Serilog.Extensions.Formatting	98%	94%	127	✔
Summary	98% (236 / 241)	94% (128 / 136)	127	✔

[github-actions]

Platform: ubuntu-latest

Package	Line Rate	Branch Rate	Complexity	Health
Serilog.Extensions.Formatting	98%	94%	127	✔
Summary	98% (236 / 241)	94% (128 / 136)	127	✔

[github-actions]

Platform: windows-latest

Package	Line Rate	Branch Rate	Complexity	Health
Serilog.Extensions.Formatting	98%	94%	127	✔
Summary	98% (236 / 241)	94% (128 / 136)	127	✔