Remove outdated System.Text.Json pinned reference

[paulirwin]

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Remove outdated System.Text.Json pinned reference

Description

This was necessary at one point in the past to resolve a vulnerable package warning; it is no longer necessary since STJ ships with .NET 8/10 targeted by the OpenNLP library. Combined with #1435, there are now zero warnings when building the solution again.

[Copilot]

Pull request overview

Removes the explicit, centrally-versioned System.Text.Json package pin that was previously added to override a vulnerable transitive dependency in the OpenNLP analysis module, aligning dependency management with the current .NET (net8/net10) targeting and updated dependency stack (notably in combination with #1435).

Changes:

• Removed the direct System.Text.Json PackageReference override from Lucene.Net.Analysis.OpenNLP.csproj.
• Removed the now-unused SystemTextJsonPackageVersion property from .build/dependencies.props.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Lucene.Net.Analysis.OpenNLP/Lucene.Net.Analysis.OpenNLP.csproj	Drops the explicit System.Text.Json package pin/override previously used to address a vulnerable transitive dependency.
.build/dependencies.props	Removes the SystemTextJsonPackageVersion property since it’s no longer referenced.

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