Configure Renovate to handle nuspec files

I recently mentioned that Renovate's NuGet manager only supports certain files by default, and .nuspec files are not among them. These are XML manifests that describe the metadata of a NuGet package. Although nowadays, SDK-style projects are sufficient for most cases to describe and generate NuGet packages, there are still many very popular projects that rely on .nuspec files, as shown by this search on GitHub.

.nuspec files can contain references to dependencies, making them important to …

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