Bump Microsoft.Extensions.Configuration.Json from 7.0.0 to 8.0.0 in /tests

[dependabot[bot]]

Bumps Microsoft.Extensions.Configuration.Json from 7.0.0 to 8.0.0.

Release notes

Sourced from Microsoft.Extensions.Configuration.Json's releases.

.NET 8.0.0

Release

.NET 8.0 RC 2

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.NET 8.0 RC 1

Release

.NET 8.0 Preview 7

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.NET 8.0 Preview 6

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.NET 8.0 Preview 5

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.NET 8.0 Preview 4

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.NET 8.0 Preview 3

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.NET 8.0 Preview 2

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.NET 8.0 Preview 1

Release

.NET 7.0.14

Release

.NET 7.0.13

Release

.NET 7.0.12

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.NET 7.0.11

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.NET 7.0.10

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.NET 7.0.9

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.NET 7.0.8

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... (truncated)

Commits

• 5535e31 Merge in 'release/8.0' changes
• e0bed94 Update dependencies from https://github.com/dotnet/emsdk build 20231030.2 (#9...
• 0395649 Merge in 'release/8.0' changes
• 0a7709a [release/8.0] Bump net7 downlevel version to 7.0.14 (#94192)
• a60d358 Merge in 'release/8.0' changes
• 7331dcb [8.0] Update MsQuic (#93979)
• 17ea9ab Merged PR 34793: [internal/release/8.0] Merge from public
• 2066e8f Apply suggestions from code review
• 59edaad [release/8.0] Honor JsonSerializerOptions.PropertyNameCaseInsensitive in prop...
• 488a8a3 [release/8.0][wasm] Fix perf pipeline runs (#93888)
• Additional commits viewable in compare view

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[dependabot[bot]]

Looks like Microsoft.Extensions.Configuration.Json is up-to-date now, so this is no longer needed.