go-ffuf: Update to 1.2.1

pkgsrc changes:
- Switch to use go-module.mk (per upstream)

Changes:
1.2.1
-----
- Changed
  - Add `-input-shell` flag

1.2.0
-----
- New
  - Added 405 Method Not Allowed to list of status codes matched by default.
  - New CLI flag `-rate` to set maximum rate of requests per second.
    The adjustment is dynamic.
  - New CLI flag `-config` to define a configuration file with preconfigured
    settings for the job.
  - Ffuf now reads a default configuration file `$HOME/.ffufrc` upon startup.
    Options set in this file are overwritten by the ones provided on CLI.
  - Change banner logging to stderr instead of stdout.
  - New CLI flag `-or` to avoid creating result files if we didn't get any.
  - New CLI flag `-input-shell` to set the shell to be used by `input-cmd`

- Changed
  - Pre-flight errors are now displayed also after the usage text to prevent
    the need to scroll through backlog.
  - Cancelling via SIGINT (Ctrl-C) is now more responsive
  - Fixed issue where a thread would hang due to TCP errors
  - Fixed the issue where the option -ac was overwriting existing filters.
    Now auto-calibration will add them where needed.
  - The `-w` flag now accepts comma delimited values in the form of
    `file1:W1,file2:W2`.
  - Links in the HTML report are now clickable
  - Fixed panic during wordlist flag parsing in Windows systems.

(leot)