chore: upgrade to nightly-2023-10-15 #1869

Job	Run time
Format	29s
Check docs	1m 5s
Build	2m 30s
Clippy	2m 16s
Check	1m 37s
Test	1m 56s
Run Hermit for Rust (x86_64 + kvm)	4m 59s
Run (x86_64, rusty_demo, none, dev)	4m 37s
Run (x86_64, rusty_demo, none, release)	3m 41s
Run (x86_64, httpd, virtio-net-pci, dev)	3m 56s
Run (x86_64, httpd, virtio-net-pci, release)	3m 53s
Run (x86_64, httpd, rtl8139, dev)	3m 47s
Run (x86_64, httpd, rtl8139, release)	3m 23s
Run (x86_64, testudp, virtio-net-pci, dev)	3m 29s
Run (x86_64, testudp, virtio-net-pci, release)	3m 9s
Run (x86_64, testudp, rtl8139, dev)	3m 39s
Run (x86_64, testudp, rtl8139, release)	3m 33s
Run (x86_64, hello_world, none, dev)	3m 14s
Run (x86_64, hello_world, none, release)	3m 0s
Run (aarch64, rusty_demo, none, dev)	4m 29s
Run (aarch64, rusty_demo, none, release)	3m 42s
Run (aarch64, httpd, virtio-net-pci, dev)	3m 29s
Run (aarch64, httpd, virtio-net-pci, release)	4m 7s
Run (aarch64, testudp, virtio-net-pci, dev)	3m 11s
Run (aarch64, testudp, virtio-net-pci, release)	4m 12s
	1h 21m 23s

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