[chore] update dependencies (#4386)

- codeberg.org/gruf/go-bytesize v1.0.3 -> v1.0.4
- codeberg.org/gruf/go-kv/v2 v2.0.6 -> v2.0.7
- codeberg.org/gruf/go-mutexes v1.5.2 -> v1.5.3
- codeberg.org/gruf/go-structr v0.9.7 -> v0.9.8
- codeberg.org/gruf/go-ffmpreg v0.6.8 -> v0.6.9
- github.com/tomnomnom/linkheader HEAD@2018 -> HEAD@2025

all of the above codeberg.org/gruf updates are in preparation for Go1.25, except for bytesize, and also ffmpreg which is a rebuild with the latest version of ffmpeg (v5.1.7)

Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4386
Co-authored-by: kim <grufwub@gmail.com>
Co-committed-by: kim <grufwub@gmail.com>

vendor/codeberg.org/gruf/go-mangler/v2/slice.go

@@ -0,0 +1,95 @@
+package mangler
+
+import (
+	"reflect"
+	"unsafe"
+
+	"codeberg.org/gruf/go-xunsafe"
+)
+
+// iterSliceType returns a Mangler capable of iterating
+// and mangling the given slice type currently in TypeIter{}.
+// note this will fetch sub-Mangler for slice element type.
+func iterSliceType(t xunsafe.TypeIter) Mangler {
+
+	// Get nested element type.
+	elem := t.Type.Elem()
+	esz := elem.Size()
+
+	// Get nested elem TypeIter{} with flags.
+	flags := xunsafe.ReflectSliceElemFlags(elem)
+	et := t.Child(elem, flags)
+
+	// Prefer to use a known slice mangler func.
+	if fn := mangleKnownSlice(et); fn != nil {
+		return fn
+	}
+
+	// Get elem mangler.
+	fn := loadOrGet(et)
+	if fn == nil {
+		return nil
+	}
+
+	return func(buf []byte, ptr unsafe.Pointer) []byte {
+		// Get data as unsafe slice header.
+		hdr := (*xunsafe.Unsafeheader_Slice)(ptr)
+		if hdr == nil || hdr.Data == nil {
+
+			// Append nil indicator.
+			buf = append(buf, '0')
+			return buf
+		}
+
+		// Append not-nil flag.
+		buf = append(buf, '1')
+
+		for i := 0; i < hdr.Len; i++ {
+			// Mangle at array index.
+			offset := esz * uintptr(i)
+			ptr = add(hdr.Data, offset)
+			buf = fn(buf, ptr)
+			buf = append(buf, ',')
+		}
+
+		if hdr.Len > 0 {
+			// Drop final comma.
+			buf = buf[:len(buf)-1]
+		}
+
+		return buf
+	}
+}
+
+// mangleKnownSlice loads a Mangler function for a
+// known slice-of-element type (in this case, primtives).
+func mangleKnownSlice(t xunsafe.TypeIter) Mangler {
+	switch t.Type.Kind() {
+	case reflect.String:
+		return mangle_string_slice
+	case reflect.Bool:
+		return mangle_bool_slice
+	case reflect.Int,
+		reflect.Uint,
+		reflect.Uintptr:
+		return mangle_int_slice
+	case reflect.Int8, reflect.Uint8:
+		return mangle_8bit_slice
+	case reflect.Int16, reflect.Uint16:
+		return mangle_16bit_slice
+	case reflect.Int32, reflect.Uint32:
+		return mangle_32bit_slice
+	case reflect.Int64, reflect.Uint64:
+		return mangle_64bit_slice
+	case reflect.Float32:
+		return mangle_32bit_slice
+	case reflect.Float64:
+		return mangle_64bit_slice
+	case reflect.Complex64:
+		return mangle_64bit_slice
+	case reflect.Complex128:
+		return mangle_128bit_slice
+	default:
+		return nil
+	}
+}