all: apply modernisers

Signed-off-by: Ophestra <cat@gensokyo.uk>

test/internal/sandbox/assert.go

@@ -1,11 +1,11 @@
 //go:build testtool
 
-/*
-Package sandbox provides utilities for checking sandbox outcome.
-
-This package must never be used outside integration tests, there is a much better native implementation of mountinfo
-in the public sandbox/vfs package. Files in this package are excluded by the build system to prevent accidental misuse.
-*/
+// Package sandbox provides utilities for checking sandbox outcome.
+//
+// This package must never be used outside integration tests, there is a much
+// better native implementation of mountinfo in the public sandbox/vfs package.
+// Files in this package are excluded by the build system to prevent accidental
+// misuse.
 package sandbox
 
 import (
@@ -204,8 +204,8 @@ func MustCheckFilter(pid int, want string) {
 		return
 	}
 
-	var perr *ptraceError
-	if !errors.As(err, &perr) {
+	perr, ok := errors.AsType[*ptraceError](err)
+	if !ok {
 		fatalf("%s", err)
 	}
 	switch perr.op {