aarch64-prep: Update Cargo.lock

Needed to work with the latest redox_syscall mods.
7 jobs for aarch64-prep in 37 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
failed #7702
build

00:00:37

 
  Test
skipped #7704
allowed to fail
code_quality
skipped #7708
allowed to fail
container_scanning
skipped #7707
allowed to fail
dependency_scanning
skipped #7705
allowed to fail
license_management
skipped #7706
allowed to fail
sast
skipped #7703
test
 
Name Stage Failure
failed
build Build
2019-01-15T12:30:50.642016300Z mount: permission denied (are you root?)
2019-01-15T12:30:50.642359957Z Could not mount /sys/kernel/security.
2019-01-15T12:30:50.642371344Z AppArmor detection and --privileged mode might break.
2019-01-15T12:30:50.643560198Z mount: permission denied (are you root?)

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Pulling docker image docker:stable-git ...
ERROR: Job failed: Error response from daemon: error parsing HTTP 404 response body: invalid character '<' looking for beginning of value: "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 3.2 Final//EN\">\n<title>404 Not Found</title>\n<h1>Not Found</h1>\n<p>The requested URL was not found on the server. If you entered the URL manually please check your spelling and try again.</p>\n" (executor_docker.go:168:2s)