(MAINT) Change Mkdir(All)? perms from 750 -> 0750

Prior to this commit, when running linting checks locally, you
would encounter the following error:

```
SA9002: file mode '750' evaluates to 01356; did you mean '0750'
```

This commit fixes the perm value to avoid this error.

Also changes a `0755` perm setting to a more secure `0750` in
`tar_test.go`

internal/pkg/pct/build_test.go

@@ -131,7 +131,7 @@ func TestBuild(t *testing.T) {
  afs := &afero.Afero{Fs: fs}
 
  for _, path := range tt.mockDirs {
- afs.Mkdir(path, 750) //nolint:gosec,errcheck // this result is not used in a secure application
+ afs.Mkdir(path, 0750) //nolint:gosec,errcheck // this result is not used in a secure application
  }
 
  for _, path := range tt.mockFiles {

internal/pkg/pct/pct_test.go

@@ -228,7 +228,7 @@ Summary: {{.example_replace.summary}}`,
  // Create the template
  templateDir := filepath.Join(tt.args.info.TemplateCache, tt.args.info.SelectedTemplate)
  contentDir := filepath.Join(templateDir, "content")
- afs.MkdirAll(contentDir, 750) //nolint:errcheck
+ afs.MkdirAll(contentDir, 0750) //nolint:errcheck
  // Create template config
  config, _ := afs.Create(filepath.Join(templateDir, "pct-config.yml"))
  config.Write([]byte(tt.args.templateConfig)) //nolint:errcheck
@@ -313,7 +313,7 @@ template:
  // Create the template
  templateDir := filepath.Join(tt.args.templateCache, tt.args.selectedTemplate)
  contentDir := filepath.Join(templateDir, "content")
- afs.MkdirAll(contentDir, 750) //nolint:errcheck
+ afs.MkdirAll(contentDir, 0750) //nolint:errcheck
  // Create template config
  config, _ := afs.Create(filepath.Join(templateDir, "pct-config.yml"))
  config.Write([]byte(tt.args.templateConfig)) //nolint:errcheck

internal/pkg/tar/tar_test.go

@@ -38,7 +38,7 @@ func TestTar(t *testing.T) {
 
  fs := afero.NewMemMapFs()
  afs := &afero.Afero{Fs: fs}
- afs.MkdirAll(tt.args.source, 755) //nolint:errcheck
+ afs.MkdirAll(tt.args.source, 0750) //nolint:errcheck
 
  tar := &tar.Tar{AFS: afs}
  tarFilePath, err := tar.Tar(tt.args.source, tt.args.target)