Merge #11141

11141: Fix invalid cast in analyzer_plugin.go r=Frassle a=Frassle

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# Description

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Fixes #11140

## Checklist

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- [ ] I have added tests that prove my fix is effective or that my feature works
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- [x] I have run `make changelog` and committed the `changelog/pending/<file>` documenting my change
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Co-authored-by: Fraser Waters <fraser@pulumi.com>

changelog/pending/20221025--engine--fix-an-invalid-cast-in-analyzer-plugins.yaml

@@ -0,0 +1,4 @@
+changes:
+- type: fix
+  scope: engine
+  description: Fix an invalid cast in analyzer plugins.

sdk/go/common/resource/plugin/analyzer_plugin.go

@@ -615,7 +615,8 @@ func convertConfigSchema(schema *pulumirpc.PolicyConfigSchema) *AnalyzerPolicyCo
 
 	props := make(map[string]JSONSchema)
 	for k, v := range unmarshalMap(schema.GetProperties()) {
-		props[k] = v.(JSONSchema)
+		s := v.(map[string]interface{})
+		props[k] = JSONSchema(s)
 	}
 
 	return &AnalyzerPolicyConfigSchema{