Update to rustix 0.26.2. (#3521)

This pulls in a fix for Android, where Android's seccomp policy on older
versions is to make `openat2` irrecoverably crash the process, so we have
to do a version check up front rather than relying on `ENOSYS` to
determine if `openat2` is supported.

And it pulls in the fix for the link errors when multiple versions of
rsix/rustix are linked in.

And it has updates for two crate renamings: rsix has been renamed to
rustix, and unsafe-io has been renamed to io-extras.

crates/wasi-common/src/snapshots/preview_1.rs

@@ -112,7 +112,7 @@ impl TryFrom<std::io::Error> for types::Errno {
     fn try_from(err: std::io::Error) -> Result<types::Errno, Error> {
         #[cfg(unix)]
         fn raw_error_code(err: &std::io::Error) -> Option<types::Errno> {
-            use rsix::io::Error;
+            use rustix::io::Error;
             match Error::from_io_error(err) {
                 Some(Error::PIPE) => Some(types::Errno::Pipe),
                 Some(Error::PERM) => Some(types::Errno::Perm),