Bump NSubstitute from 5.1.0 to 5.3.0 in /src

Bumps [NSubstitute](https://github.com/nsubstitute/NSubstitute) from 5.1.0 to 5.3.0.
- [Release notes](https://github.com/nsubstitute/NSubstitute/releases)
- [Changelog](https://github.com/nsubstitute/NSubstitute/blob/main/CHANGELOG.md)
- [Commits](nsubstitute/NSubstitute@v5.1.0...v5.3.0)

---
updated-dependencies:
- dependency-name: NSubstitute
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

src/GitReleaseManager.Core.Tests/GitReleaseManager.Core.Tests.csproj

@@ -24,7 +24,7 @@
           <PrivateAssets>all</PrivateAssets>
         </PackageReference>
         <PackageReference Include="NGitLab" Version="7.0.1" />
-        <PackageReference Include="NSubstitute" Version="5.1.0" />
+        <PackageReference Include="NSubstitute" Version="5.3.0" />
         <PackageReference Include="NUnit" Version="4.1.0" />
         <PackageReference Include="NUnit.Analyzers" Version="4.2.0">
           <PrivateAssets>all</PrivateAssets>
@@ -34,4 +34,4 @@
         <PackageReference Include="Octokit" Version="12.0.0" />
         <PackageReference Include="Shouldly" Version="4.2.1" />
     </ItemGroup>
-</Project>
+</Project>

src/GitReleaseManager.Tests/GitReleaseManager.Tests.csproj

@@ -24,7 +24,7 @@
           <PrivateAssets>all</PrivateAssets>
         </PackageReference>
         <PackageReference Include="NGitLab" Version="7.0.1" />
-        <PackageReference Include="NSubstitute" Version="5.1.0" />
+        <PackageReference Include="NSubstitute" Version="5.3.0" />
         <PackageReference Include="NUnit" Version="4.1.0" />
         <PackageReference Include="NUnit.Analyzers" Version="4.2.0">
           <PrivateAssets>all</PrivateAssets>
@@ -33,4 +33,4 @@
         <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
         <PackageReference Include="Octokit" Version="12.0.0" />
     </ItemGroup>
-</Project>
+</Project>