Back to pull request #6611

caddytls: Drop `rate_limit` and `burst`, has been deprecated #5157

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Job	Run time
build (aix, 1.22)	23s
build (aix, 1.23)	55s
build (linux, 1.22)	1m 1s
build (linux, 1.23)	51s
build (solaris, 1.22)	1m 2s
build (solaris, 1.23)	58s
build (illumos, 1.22)	1m 4s
build (illumos, 1.23)	57s
build (dragonfly, 1.22)	1m 10s
build (dragonfly, 1.23)	58s
build (freebsd, 1.22)	1m 0s
build (freebsd, 1.23)	52s
build (openbsd, 1.22)	1m 5s
build (openbsd, 1.23)	57s
build (windows, 1.22)	1m 4s
build (windows, 1.23)	53s
build (darwin, 1.22)	1m 9s
build (darwin, 1.23)	59s
build (netbsd, 1.22)	1m 1s
build (netbsd, 1.23)	57s
	19m 16s