Wait for GPU free memory reporting to converge

The GPU drivers take a while to update their free memory reporting, so we need
to wait until the values converge with what we're expecting before proceeding
to start another runner in order to get an accurate picture.

gpu/cpu_common.go

@@ -8,14 +8,14 @@ import (
 
 func GetCPUVariant() string {
 	if cpu.X86.HasAVX2 {
-		slog.Info("CPU has AVX2")
+		slog.Debug("CPU has AVX2")
 		return "avx2"
 	}
 	if cpu.X86.HasAVX {
-		slog.Info("CPU has AVX")
+		slog.Debug("CPU has AVX")
 		return "avx"
 	}
-	slog.Info("CPU does not have vector extensions")
+	slog.Debug("CPU does not have vector extensions")
 	// else LCD
 	return ""
 }