feat: Bump vendored cpp11 to v0.5.0 #1195

Job	Run time
Smoke test: stock R	22m 44s
Check matrix	7s
rcc: ${{ matrix.os }} (${{ matrix.r }}) ${{ matrix.desc }}	0s
Without adbcdrivermanager	36m 13s
Without arrow	35m 7s
Without bit64	38m 27s
Without clock	35m 14s
Without DBItest	34m 46s
Without dbplyr	34m 46s
Without dplyr	35m 4s
	4h 32m 28s

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