fileperms: newer Go 1.13+ octal literal format

Problem: While removing cgroupsv1 code, I noticed my neovim Go config
automatically changed fileperms to the new octal format and I didn't
want that polluting my diffs.

Decision: I thought it best to switch to the new octal format in a dedicated PR.

Action:
- Cursor switched to new octal format for all fileperm ocurrences in Go
 source and test files.
- vendor/, docs/ and non-Go files were ignored.
- Reviewed manually.

Ref: https://go.dev/ref/spec#Go_1.13

Signed-off-by: Lokesh Mandvekar <lsm5@redhat.com>

pkg/machine/qemu/command/command.go

@@ -116,7 +116,7 @@ type Monitor struct {
 // NewQMPMonitor creates the monitor subsection of our vm
 func NewQMPMonitor(name string, machineRuntimeDir *define.VMFile) (Monitor, error) {
 	if err := fileutils.Exists(machineRuntimeDir.GetPath()); errors.Is(err, fs.ErrNotExist) {
-		if err := os.MkdirAll(machineRuntimeDir.GetPath(), 0755); err != nil {
+		if err := os.MkdirAll(machineRuntimeDir.GetPath(), 0o755); err != nil {
 			return Monitor{}, err
 		}
 	}