[ci] update go version to 1.21 in cirrus ci

[lifubang]

As go has released v1.22.0, so there is no 1.20.x in https://go.dev/dl/?mode=json anymore.
Let's update go version to 1.21.x in cirrus ci.

This will fix the error:

# Find out the latest minor release URL.
eval $(curl -fsSL "${PREFIX}?mode=json" | jq -r  --arg Ver "$GO_VERSION" '.[] | select(.version | startswith("go\($Ver)")) | .files[] | select(.os == "linux" and .arch == "amd64" and .kind == "archive") | "filename=\"" + .filename + "\""')
curl -fsSL "$PREFIX$filename" | tar Cxz /usr/local
gzip: stdin: not in gzip format
tar: Child died with signal 13
tar: Error is not recoverable: exiting now
curl: (23) Failed writing body (679 != 1401)

[lifubang]

I let #4193 opening because there are some issues for runc with go 1.22.0.
Once #4192 merged, please rebase this PR to re-trigger the CI.

[kolyshkin]

Oh well, now vagrant up is not working in Cirrus CI. I spent an hour staring at the logs. Found out that:

• all the packages are of the same version (compared with older logs when it worked)
• CPU seems to be the same (and has vmx)
• kvm and kvm_intel kernel modules are loaded
• libvirtd is up and running, no errors in journalctl
• No AVC denials in the kernel log (except for dnsmasq trying to run /bin/true but it seems to be a known issue, which should not break anything)

I am stuck here. @AkihiroSuda can you please take a look? Here is my changes to .cirrus.yml to add debug: kolyshkin@fa15bd2

[kolyshkin]

Oh well, now vagrant up is not working in Cirrus CI. I spent an hour staring at the logs. Found out that:

• all the packages are of the same version (compared with older logs when it worked)
• CPU seems to be the same (and has vmx)
• kvm and kvm_intel kernel modules are loaded
• libvirtd is up and running, no errors in journalctl
• No AVC denials in the kernel log (except for dnsmasq trying to run /bin/true but it seems to be a known issue, which should not break anything)

I am stuck here. @AkihiroSuda can you please take a look? Here is my changes to .cirrus.yml to add debug: kolyshkin@fa15bd2

opened #4199

[kolyshkin]

We can still merge this one as it fixes the issue with cirrusci / centos tasks.