chore(deps): update Go to 1.26, bump purego, fix lint warning (#15)

- Updated Go version from 1.24.0 to 1.26.0
- Bumped ebitengine/purego v0.9.1 -> v0.10.0
- Removed dead code in SynthesisOptions.Clamp() (staticcheck S1002)

client/types/types.go

@@ -40,9 +40,8 @@ func (so *SynthesisOptions) Clamp() {
 	if so.Style > 1 || so.Style < 0 {
 		so.Style = 0.0
 	}
-	if so.UseSpeakerBoost != true && so.UseSpeakerBoost != false {
-		so.UseSpeakerBoost = true
-	}
+	// UseSpeakerBoost defaults to the zero value (false) for bool;
+	// no conditional needed as the caller sets it explicitly.
 }
 
 type SynthesisOptions struct {