Fixes Solaris CI after solaris-vm was updated to Solaris 11.4.81 CBE

It also specifies exact solaris-vm version to avoid future disruptions.

(backport <rust-lang#4462>)
(cherry picked from commit d450f9c)

Author: psumbera

.github/workflows/ci.yaml

@@ -232,7 +232,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: test on Solaris
-        uses: vmactions/solaris-vm@v1
+        uses: vmactions/solaris-vm@v1.1.3
         with:
           release: "11.4-gcc"
           usesh: true

src/unix/solarish/x86_64.rs

@@ -91,7 +91,9 @@ s_no_extra_traits! {
         #[cfg(target_os = "solaris")]
         pub uc_xrs: solaris::xrs_t,
         #[cfg(target_os = "solaris")]
-        pub uc_filler: [c_long; 3],
+        pub uc_lwpid: c_uint,
+        #[cfg(target_os = "solaris")]
+        pub uc_filler: [c_long; 2],
     }
 }