fix(app.src): delete deprecated field in app.src

Merge pull request #299 from zmstone/250911-add-changelog

docs: add changelog for 1.13.8

docs: fix change log

Prepare for tag 1.13.7

Merge pull request #288 from savonarola/20250725-fix-ping

feat: respect pingresp timeout

Merge pull request #286 from thalesmg/20250626-fix-connack-timeout-again

fix: hanging process when TLS alert happens during mqtt_connect (`tls_alert`)

Merge pull request #280 from thalesmg/20250318-fix-ws-gun-death-race

fix(ws): avoiding hanging if gun connection process dies before upgrade

Merge pull request #279 from thalesmg/fix-ssl-sock-closed

fix: hanging process when TLS alert happens during `mqtt_connect`

Merge pull request #277 from keynslug/fix/EMQX-13354/gun-ws

fix(ws): correctly adopt Gun 2.x interfaces

ci: use upload-artifact@v4

Merge pull request #276 from emqx/dev/william/prepare-rel-1.14.1

fix tls1.3 crash and prepare rel 1.14.1