`http_request.buffer_size_tx` probably needs to be raised

[the-ress]

It seems the buffer size for checking updates is too small.

I created a project off this repo and update checks were always failing:

[15:21:14.099][V][http_request.idf:178][update_task]: redirecting to url: https://github.com:443/[...].manifest.json
[15:21:14.216][V][http_request.idf:178][update_task]: redirecting to url: https://release-assets.githubusercontent.com:443/github-production-release-asset/[...]
[15:21:15.059][VV][esp-idf:000][update_task]: E (21380) HTTP_CLIENT: Out of buffer
[15:21:15.059][E][http_request.idf:183][update_task]: esp_http_client_open failed: ESP_FAIL
[15:21:15.060][E][component:314][update_task]: http_request set Error flag: unspecified
[15:21:16.057][E][component:342]: http_request cleared Error flag

After raising buffer_size_tx to 1024, it seems to work fine:

http_request:
  buffer_size_tx: 1024

[rrooggiieerr]

I just ran into this issue 2 days ago and created an issue on the ESPHome repository with a bit more context.

esphome/esphome#13786

If you use https://<user>.github.io/<project>/firmware/<*>.manifest.json instead you won't be running into problems as that URL doesn't exceed the 512 byte buffer size