Default values for a field within an array doesn't work

[JivusAyrus]

Version: v11.1.0

The default values for attributes within an array of objects are not being applied as expected.

Reproduction Steps

1. Define a field with type as an array of struct, setting default values for some fields in that struct using the envDefault tag.
2. Parse the configuration using env.Parse.

type TestMetricsOTLP struct {
	RouterRuntime bool                      `yaml:"router_runtime" envDefault:"true" env:"METRICS_OTLP_ROUTER_RUNTIME"`
	Exporters     []TestMetricsOTLPExporter `yaml:"exporters"`
}

type TestMetricsOTLPExporter struct {
	Value           string `yaml:"value"`
	Exporter    string `yaml:"exporter" envDefault:"http"`
	Temporality string `yaml:"temporality" envDefault:"cumulative"`
}

func Parse() {
	config := TestMetricsOTLP{
		Exporters: []TestMetricsOTLPExporter{
			{Value: "A"},
		},
	}

	err := env.Parse(&config)
         if err != nil {
		fmt.Printf("Failed to parse: %v", err)
	}
}

func main() {
	Parse()
}

Expected Behavior

The envDefault values for Temporality and Exporter should be applied.

• config.Exporters[0].Temporality should equal "cumulative".
• config.Exporters[0].Exporter should equal "http".

Actual Behavior

Both Temporality and Exporter are equal to "".

Would a pull request for the fix be accepted?

Thanks