ci/cirrus: use Go 1.19.x not 1.19

This variable is used in curl to download a go release, so we are using
the initial Go 1.19 release in Cirrus CI, not the latest Go 1.19.x
release.

From the CI perspective, it makes more sense to use the latest release.

Add some jq magic to extract the latest minor release information
from the download page, and use it.

This brings Cirrus CI jobs logic in line with all the others (GHA,
Dockerfile), where by 1.20 we actually mean "latest 1.20.x".

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

.cirrus.yml

@@ -118,7 +118,10 @@ task:
     # Use --whatprovides since some packages are renamed.
     rpm -q --whatprovides $RPMS
     # install Go
-    curl -fsSL "https://dl.google.com/go/go${GO_VERSION}.linux-amd64.tar.gz" | tar Cxz /usr/local
+    PREFIX="https://go.dev/dl/"
+    # 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
     # install bats
     cd /tmp
     git clone https://github.com/bats-core/bats-core