rules_dotnet broken in Bazel downstream due to recent change to --toolchain_resolution_debug

[coeuvre]

https://buildkite.com/bazel/bazel-at-head-plus-downstream/builds/1984#1c810ab6-39c8-45d4-83c2-b2e2fbb8aa75

(02:10:54) ERROR: While resolving toolchains for target //tests/examples/example_tool:hello_tool.exe: no matching toolchains found for types //dotnet:toolchain_type_csharp_core
(02:10:54) ERROR: Analysis of target '//tests/examples/example_tool:hello_single_output' failed; build aborted: no matching toolchains found for types //dotnet:toolchain_type_csharp_core

https://buildkite.com/bazel/culprit-finder/builds/1319#f66fa0aa-c984-4b5c-8f84-b15918c8a5c7
Caused by bazelbuild/bazel@fbf9f9d

[katre]

rules_dotnet needs to be updated, I'll send them a PR today.

[fweikert]

Great, thank you!