chore(deps): bump Stripe.net in /fixed-price-subscriptions/server/dotnet

Bumps [Stripe.net](https://github.com/stripe/stripe-dotnet) from 44.2.0 to 44.3.0.
- [Release notes](https://github.com/stripe/stripe-dotnet/releases)
- [Changelog](https://github.com/stripe/stripe-dotnet/blob/master/CHANGELOG.md)
- [Commits](stripe/stripe-dotnet@v44.2.0...v44.3.0)

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

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

fixed-price-subscriptions/server/dotnet/dotnet.csproj

@@ -10,7 +10,7 @@
     <PackageReference Include="DotNetEnv" Version="2.4.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="[3.1,]" />
-    <PackageReference Include="Stripe.net" Version="44.2.0" />
+    <PackageReference Include="Stripe.net" Version="44.3.0" />
   </ItemGroup>
   <ItemGroup>
     <Folder Include="Controllers\" />