Log Message:
net/lagrange: update to 1.17.6

v1.17.6

 - Fixed memory leak: fetched pages were not always released from memory
   (reference miscount).
 - Fixed minor memory leak in list widgets.
 - Gopher: Autodetect Gemtext files based on file extension.
 - Updated UI translations.

v1.17.5

 - Fixed a few small memory leaks.
 - Fixed unnecessary copying of data while waiting for an audio buffer to become
   playable.
 - Gopher: Detect audio media type from file extension with the s item type
   (it's not always WAV).
 - Content that uses charset=utf-8 is checked for validity. If the encoding is
   invalid, the content is instead decoded as CP437 (if it has ANSI escapes;
   possibly it's ASCII art) or just Latin-1.
 - Remove ANSI escapes from window titles.
 - Modified rule for when 'text/plain' is assumed to actually be 'text/gemini'
   based on the file extension.