Bump BenchmarkDotNet from 0.14.0 to 0.15.3

---
updated-dependencies:
- dependency-name: BenchmarkDotNet
  dependency-version: 0.15.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

BitFaster.Caching.Benchmarks/BitFaster.Caching.Benchmarks.csproj

@@ -23,7 +23,7 @@
 
   <ItemGroup>
     <PackageReference Include="Benchly" Version="0.7.0" />
-    <PackageReference Include="BenchmarkDotNet" Version="0.14.0" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.15.3" />
     <PackageReference Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.14.0" />
     <PackageReference Include="MathNet.Numerics" Version="5.0.0" />
     <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="9.0.2" />