Adding SHA hash to .NET Bazel rules package

Author: jimevans

WORKSPACE

@@ -112,7 +112,7 @@ pinned_maven_install()
 
 http_archive(
     name = "d2l_rules_csharp",
-    #sha256 = "7b2a83621049904b6e898ffdbe7893a5b410aedf599d63f127ef81eac839b6c1",
+    sha256 = "7b2a83621049904b6e898ffdbe7893a5b410aedf599d63f127ef81eac839b6c1",
     strip_prefix = "rules_csharp-bf24e589bbadcc20f15a16e13f577a0abd42a1d1",
     urls = [
         "https://github.com/Brightspace/rules_csharp/archive/bf24e589bbadcc20f15a16e13f577a0abd42a1d1.tar.gz",