fix: golangci-lint and gosec warnings

pkg/types/measuredValue.go

@@ -9,7 +9,7 @@ import (
 // or temperature.
 type MeasuredValue struct {
 	ID           string            `json:"id" xml:"id"`
-	Value        float64           `json:"value,string" xml:"value,string"`
+	Value        float64           `json:"value,string" xml:"value"`
 	ValueType    MeasuredValueType `json:"value_type" xml:"value_type"`
 	Date         time.Time         `json:"date" xml:"date"`
 	SensorID     string            `json:"sensor_id" xml:"sensor_id"`
@@ -21,6 +21,6 @@ type MeasuredValueType string
 
 const (
 	Humidity    MeasuredValueType = "humidity"
-	Pressure                      = "pressure"
-	Temperature                   = "temperature"
+	Pressure    MeasuredValueType = "pressure"
+	Temperature MeasuredValueType = "temperature"
 )