chore: update changelog for v1.6.0-rc1 with bugfixes, features, and d… #3208

Job	Run time
codeql / code-security (python)	1m 52s
codeql / code-security (javascript)	2m 9s
build-packages (rhel) / build	4m 36s
build-packages (fedora) / build	4m 25s
build-packages (debian) / build	4m 41s
build-packages (rhel9) / build	4m 49s
build-containers (autoconf) / build	1m 27s
build-packages (ubuntu) / build	4m 40s
build-packages (ubuntu-jammy) / build	4m 39s
build-containers (bunkerweb) / build	4m 48s
build-containers (scheduler) / build	1m 43s
build-containers (ui) / build	1m 19s
push-packages	0s
push-dev	59s
	42m 7s

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