Cleanup: use Java17' Records.

Fixes #1526.

src/main/java/de/dennisguse/opentracks/data/models/HeartRate.java

@@ -4,40 +4,13 @@ import androidx.annotation.NonNull;
 
 import java.util.Objects;
 
-public class HeartRate {
+public record HeartRate(float value) {
 
     public static HeartRate of(float value) {
         return new HeartRate(value);
     }
 
-    private final float value;
-
-    private HeartRate(float value) {
-        this.value = value;
-    }
-
     public float getBPM() {
         return value;
     }
-
-    @Override
-    public boolean equals(Object o) {
-        if (this == o) return true;
-        if (o == null || getClass() != o.getClass()) return false;
-        HeartRate heartRate = (HeartRate) o;
-        return Float.compare(heartRate.value, value) == 0;
-    }
-
-    @Override
-    public int hashCode() {
-        return Objects.hash(value);
-    }
-
-    @NonNull
-    @Override
-    public String toString() {
-        return "HeartRate{" +
-                "value=" + value + " bpm" +
-                '}';
-    }
 }