modules: Support "hugo mod get -u ./..."

[bep]

A common use case would be to have one GitHub repo with multiple modules.

It may look like this:

├── LICENSE
├── README.md
├── alpinejs
│   ├── config.toml
│   ├── go.mod
│   ├── go.sum
│   ├── layouts
│   │   └── partials
│   │       └── jslibs
│   │           └── alpinejs
│   │               └── script-src.html
│   └── resources
│       └── _gen
│           ├── assets
│           └── images
├── alpinejs_turbolinks
│   ├── config.toml
│   ├── go.mod
│   └── layouts
│       └── partials
│           └── jslibs
│               └── alpinejs_turbolinks
│                   └── script-src.html
├── resources
│   └── _gen
│       ├── assets
│       └── images
└── turbolinks
    ├── config.toml
    ├── go.mod
    ├── go.sum
    ├── layouts
    │   └── partials
    │       └── jslibs
    │           └── turbolinks
    │               └── script-src.html

It would be great if I could do hugo mod get -u ./... and update all of them in one go.

[github-actions]

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