Add changelog for 57

CHANGELOG.rst:
Add an entry for v57.
9 jobs for changelog/57 in 68 minutes and 31 seconds (queued for 5 seconds)
latest
Status Name Job ID Coverage
  Check
passed check #30276

00:00:12

 
  Build
passed build_long: [baseline iso] #30283
fast-single-thread

00:26:36

passed build_long: [baseline netboot] #30280
fast-single-thread

00:25:44

passed build_long: [releng iso] #30284
fast-single-thread

00:41:37

passed build_long: [releng netboot] #30282
fast-single-thread

00:46:57

passed build_short: [baseline bootstrap] #30277

00:18:05

passed build_short: [releng bootstrap] #30278

00:19:27

failed build_long: [baseline iso] #30279
fast-single-thread

00:08:32

failed build_long: [releng iso] #30281
fast-single-thread

00:08:32