Dependabot does not respect `ignore` version syntax for Nuget

**Package ecosystem**
nuget

**Package manager version**
N/A
**Language version**
N/A
**Manifest location and content prior to update**
https://github.com/amido/stacks-dotnet-packages-cosmosdb/pull/8/files#diff-0ee2cfdaf6f922b832e0d6b4ee312c515ff3df9f8bd22499d3222de34729b1bc

**dependabot.yml content**
https://github.com/amido/stacks-dotnet-packages-cosmosdb/blob/3711de53ac51eddd907fbfa75f6235f16c28500a/.github/dependabot.yml#L6-L7

Note we specify 5.0 which in Nuget terms means ignore 5.0 and above inclusive: https://docs.microsoft.com/en-us/nuget/concepts/package-versioning#version-ranges

**Updated dependency**
> Bump Microsoft.Extensions.Diagnostics.HealthChecks from 3.1.16 to 5.0.8 in /src

**What you expected to see, versus what you actually saw**
I expect the PR 8 here to be closed as we're telling it to ignore all >= 5.0 packages: https://github.com/amido/stacks-dotnet-packages-cosmosdb/pull/8

Instead PRs 9 and 7 closed as soon as I added the ignore, but 8 is ignoring the ignore file.

**Native package manager behavior**
N/A

**Images of the diff or a link to the PR, issue or logs**

Processed the ignore:
https://github.com/amido/stacks-dotnet-packages-cosmosdb/pull/9

Ignores the ignore
https://github.com/amido/stacks-dotnet-packages-cosmosdb/pull/8

Start with the linked dependabot.yml configuration and the NuGet manifest and compare the behavior shown in pull requests 7, 8, and 9. Trace how the NuGet ignore value `5.0` is interpreted, then verify that updates at or above that version are excluded and the affected pull request behavior matches the expectation.

Written by the indexing model from the issue text.