Update stellar-xdr (#1472) #4252

Job	Run time
check-git-rev-deps	8s
cargo-deny (advisories)	42s
cackle	1m 20s
cargo-deny (bans licenses sources)	43s
build-and-test (msrv, 22, ubuntu-latest, wasm32-unknown-unknown, false)	9m 22s
fmt	7s
build-and-test (msrv, 22, ubuntu-latest-16-cores, x86_64-unknown-linux-gnu, true)	21m 1s
build-and-test (latest, 22, ubuntu-latest, wasm32-unknown-unknown, false)	11m 1s
semver-checks	4m 2s
build-and-test (latest, 22, ubuntu-latest-16-cores, x86_64-unknown-linux-gnu, true)	18m 54s
publish-dry-run (ubuntu-latest, wasm32-unknown-unknown) / publish-dry-run / publish-dry-run	1h 17m 10s
publish-dry-run (ubuntu-latest, x86_64-unknown-linux-gnu) / publish-dry-run / publish-dry-run	1h 15m 33s
complete	1s
	3h 40m 4s

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