Eliminate deprecated CBOR formats #2129

Job	Run time
maybe-expedite	3s
lint	3m 53s
test (third-party, bincode, stable, false)	25m 7s
test (third-party, bincode, stable, true)	25m 16s
test (third-party, bincode, nightly, false)	28m 54s
test (third-party, bincode, nightly, true)	28m 18s
test (third-party, postcard, stable, false)	25m 40s
test (third-party, postcard, stable, true)	25m 16s
test (third-party, postcard, nightly, false)	27m 57s
test (third-party, postcard, nightly, true)	27m 58s
test (other, bincode, stable, false)	23m 52s
test (other, bincode, stable, true)	23m 25s
test (other, bincode, nightly, false)	29m 12s
test (other, bincode, nightly, true)	30m 9s
test (other, postcard, stable, false)	25m 19s
test (other, postcard, stable, true)	25m 38s
test (other, postcard, nightly, false)	30m 44s
test (other, postcard, nightly, true)	31m 6s
all-checks	1s
	7h 17m 48s

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