ci/gha: add go 1.23-rc2

Signed-off-by: Kir Kolyshkin <[email protected]>

Author: kolyshkin

.github/workflows/test.yml

@@ -24,7 +24,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-20.04, ubuntu-24.04, actuated-arm64-6cpu-8gb]
-        go-version: [1.21.x, 1.22.x]
+        go-version: [1.21.x, 1.22.x, 1.23.0-rc.2]
         rootless: ["rootless", ""]
         race: ["-race", ""]
         criu: ["", "criu-dev"]