socat: update license
socat: update license

```
/* source: socat.c */
/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
/* Published under the GNU General Public License V.2, see file COPYING */

/* this is the main source, including command line option parsing, general
   control, and the data shuffler */
```

Closes #93014.

Signed-off-by: Rui Chen <907c7afd57be493757f13ccd1dd45dddf02db069@chenrui.dev>
Signed-off-by: Sean Molenaar <2b250e3fea88cfef248b497ad5fc17f7dc435154@users.noreply.github.com>
Signed-off-by: BrewTestBot <8a898ee6867e4f2028e63d2a6319b2224641c06c@users.noreply.github.com>

uyjulian/homebrew-core,uyjulian/homebrew-core,stgraber/homebrew-core,zyedidia/homebrew-core,makigumo/homebrew-core,adam-moss/homebrew-core,cblecker/homebrew-core,stgraber/homebrew-core,nandub/homebrew-core,chrisfinazzo/homebrew-core,cblecker/homebrew-core,filcab/homebrew-core,adam-moss/homebrew-core,lemzwerg/homebrew-core,makigumo/homebrew-core,mfikes/homebrew-core,nbari/homebrew-core,sjackman/homebrew-core,Homebrew/homebrew-core,sjackman/homebrew-core,filcab/homebrew-core,nbari/homebrew-core,nandub/homebrew-core,chrisfinazzo/homebrew-core,zyedidia/homebrew-core,Homebrew/homebrew-core,mfikes/homebrew-core,lemzwerg/homebrew-core