Support Go 1.20 "created by" lines

In Go 1.20, the "created by" lines
do not include the "in goroutine" portion.

internal/stack/stacks.go

@@ -211,6 +211,7 @@ func getStackBuffer(all bool) []byte {
 //
 //	example.com/path/to/package.funcName(args...)
 //	example.com/path/to/package.(*typeName).funcName(args...)
+//	created by example.com/path/to/package.funcName
 //	created by example.com/path/to/package.funcName in goroutine [...]
 func parseFuncName(line string) (string, error) {
 	var name string
@@ -219,8 +220,9 @@ func parseFuncName(line string) (string, error) {
 		// and before " in goroutine [...]".
 		idx := strings.Index(after, " in goroutine")
 		if idx >= 0 {
-			name = after[:idx]
+			after = after[:idx]
 		}
+		name = after
 	} else if idx := strings.LastIndexByte(line, '('); idx >= 0 {
 		// The function name is the part before the last '('.
 		name = line[:idx]

internal/stack/stacks_test.go

@@ -177,7 +177,12 @@ func TestParseFuncName(t *testing.T) {
 			want: "example.com/foo/bar.(*baz).qux",
 		},
 		{
-			name: "created by",
+			name: "created by", // Go 1.20
+			give: "created by example.com/foo/bar.baz",
+			want: "example.com/foo/bar.baz",
+		},
+		{
+			name: "created by/in goroutine", // Go 1.21
 			give: "created by example.com/foo/bar.baz in goroutine 123",
 			want: "example.com/foo/bar.baz",
 		},