[1.1] Add Go 1.23, drop 1.21

As of commit 096e6f8 we are ready for Go 1.23.

All that's left to do is:
 - Cirrus CI: switch from Go 1.21 to Go 1.22;
 - GHA CI: drop go 1.21, add 1.23 to test matrix;
 - Dockerfile: switch from Go 1.21.x to 1.22.x.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

.cirrus.yml

@@ -77,7 +77,7 @@ task:
   env:
     HOME: /root
     CIRRUS_WORKING_DIR: /home/runc
-    GO_VERSION: "1.21"
+    GO_VERSION: "1.22"
     BATS_VERSION: "v1.9.0"
     RPMS: gcc git iptables jq glibc-static libseccomp-devel make criu fuse-sshfs
     # yamllint disable rule:key-duplicates

.github/workflows/test.yml

@@ -21,7 +21,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go-version: [1.17.x, 1.21.x, 1.22.x]
+        go-version: [1.17.x, 1.22.x, 1.23.x]
         rootless: ["rootless", ""]
         race: ["-race", ""]
         criu: [""]

Dockerfile

@@ -1,4 +1,4 @@
-ARG GO_VERSION=1.21
+ARG GO_VERSION=1.22
 ARG BATS_VERSION=v1.9.0
 ARG LIBSECCOMP_VERSION=2.5.5