upgrade to yaml.v3 (#1148)

* upgrade to yaml.v3

The main nice fix here is that maps unmarshal into `map[string]any`
instead of `map[any]any`, so it cleans things up a bit.

* add config.AsBool

Since yaml.v3 doesn't automatically convert yes to bool now, for
backwards compat

* use type aliases for m

* more cleanup

* more cleanup

* more cleanup

* go mod cleanup

util/error.go

@@ -9,11 +9,11 @@ import (
 
 type ContextualError struct {
 	RealError error
-	Fields    map[string]interface{}
+	Fields    map[string]any
 	Context   string
 }
 
-func NewContextualError(msg string, fields map[string]interface{}, realError error) *ContextualError {
+func NewContextualError(msg string, fields map[string]any, realError error) *ContextualError {
 	return &ContextualError{Context: msg, Fields: fields, RealError: realError}
 }
 

util/error_test.go

@@ -9,7 +9,7 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-type m map[string]interface{}
+type m = map[string]any
 
 type TestLogWriter struct {
 	Logs []string