chore: Bump PolySharp from 1.14.1 to 1.15.0

---
updated-dependencies:
- dependency-name: PolySharp
  dependency-version: 1.15.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: PolySharp
  dependency-version: 1.15.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/FunctionalStateMachine.CommandRunner/FunctionalStateMachine.CommandRunner.csproj

@@ -16,7 +16,7 @@
 
     <!-- Polyfills for C# 9+ features on netstandard2.0 -->
     <ItemGroup>
-        <PackageReference Include="PolySharp" Version="1.14.1" PrivateAssets="all" />
+        <PackageReference Include="PolySharp" Version="1.15.0" PrivateAssets="all" />
         <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="2.0.0" />
     </ItemGroup>
 

src/FunctionalStateMachine.Core/FunctionalStateMachine.Core.csproj

@@ -16,7 +16,7 @@
 
     <!-- Polyfills for C# 9+ features on netstandard2.0 -->
     <ItemGroup>
-        <PackageReference Include="PolySharp" Version="1.14.1" PrivateAssets="all" />
+        <PackageReference Include="PolySharp" Version="1.15.0" PrivateAssets="all" />
     </ItemGroup>
 
 </Project>