Bump FodyHelpers and NETStandard.Library in /src

Bumps [FodyHelpers](https://github.com/Fody/Fody) and NETStandard.Library. These dependencies needed to be updated together.

Updates `FodyHelpers` from 6.8.1 to 6.9.1
- [Release notes](https://github.com/Fody/Fody/releases)
- [Commits](Fody/Fody@6.8.1...6.9.1)

Updates `NETStandard.Library` from 2.0.3 to 2.0.3

---
updated-dependencies:
- dependency-name: FodyHelpers
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: NETStandard.Library
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

src/LoadAssembliesOnStartup.Fody.Tests/LoadAssembliesOnStartup.Fody.Tests.csproj

@@ -15,7 +15,7 @@
   <ItemGroup>
     <PackageReference Include="ApprovalTests" Version="6.0.0" />
     <PackageReference Include="Fody" Version="6.9.1" PrivateAssets="None" />
-    <PackageReference Include="FodyHelpers" Version="6.8.1" />
+    <PackageReference Include="FodyHelpers" Version="6.9.1" />
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="Moq" Version="4.20.70" />

src/LoadAssembliesOnStartup.Fody/LoadAssembliesOnStartup.Fody.csproj

@@ -20,7 +20,7 @@
 
   <ItemGroup>
     <PackageReference Include="Fody" Version="6.9.1" PrivateAssets="none" />
-    <PackageReference Include="FodyHelpers" Version="6.8.1" PrivateAssets="All" />
+    <PackageReference Include="FodyHelpers" Version="6.9.1" PrivateAssets="All" />
     <PackageReference Include="FodyPackaging" Version="6.9.1" PrivateAssets="All" />
     <PackageReference Update="NETStandard.Library" Version="2.0.3" />
   </ItemGroup>