build(deps): bump IndexRange from 1.0.2 to 1.0.3 in /src (#860)

Bumps [IndexRange](https://github.com/bgrainger/IndexRange) from 1.0.2 to 1.0.3.
- [Release notes](https://github.com/bgrainger/IndexRange/releases)
- [Changelog](https://github.com/bgrainger/IndexRange/blob/master/VersionHistory.md)
- [Commits](bgrainger/IndexRange@v1.0.2...v1.0.3)

---
updated-dependencies:
- dependency-name: IndexRange
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/Akavache.Tests/Akavache.Tests.csproj

@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup Condition="$(TargetFramework.StartsWith('net4'))">
-    <PackageReference Include="IndexRange" Version="1.0.2" />
+    <PackageReference Include="IndexRange" Version="1.0.3" />
   </ItemGroup>
 
   <ItemGroup>