[chore] update go ffmpreg to v0.6.0 (#3515)

* pull in go-ffmpreg v0.6.0

* add code comment

* grrr linter

* set empty module name when calling ffmpeg / ffprobe

vendor/codeberg.org/gruf/go-ffmpreg/embed/lib.go

@@ -0,0 +1,39 @@
+package embed
+
+import (
+	"bytes"
+	"compress/gzip"
+	_ "embed"
+	"io"
+	"os"
+)
+
+func init() {
+	var err error
+
+	if path := os.Getenv("FFMPREG_WASM"); path != "" {
+		// Read file into memory.
+		B, err = os.ReadFile(path)
+		if err != nil {
+			panic(err)
+		}
+	}
+
+	// Wrap bytes in reader.
+	b := bytes.NewReader(B)
+
+	// Create unzipper from reader.
+	gz, err := gzip.NewReader(b)
+	if err != nil {
+		panic(err)
+	}
+
+	// Extract gzipped binary.
+	B, err = io.ReadAll(gz)
+	if err != nil {
+		panic(err)
+	}
+}
+
+//go:embed ffmpreg.wasm.gz
+var B []byte