k8s: change review concurrency to 32

Reduce the SASHIKO__REVIEW__CONCURRENCY environment variable value
from 60 to 32 in the base application deployment configuration.

Signed-off-by: Roman Gushchin <roman.gushchin@linux.dev>

Author: rgushchin

sashiko.dev/base/app/sashiko-k8s.yaml

@@ -88,7 +88,7 @@ spec:
                 batman,linux-s390,linux-devicetree,imx,linux-sunxi,linux-amlogic,
                 live-patching,openvpn-devel,platform-driver-x86,linux-arm-msm
             - name: SASHIKO__REVIEW__CONCURRENCY
-              value: "60"
+              value: "32"
             - name: SASHIKO__SMTP__SENDER_ADDRESS
               value: "sashiko-bot@kernel.org"
             - name: SASHIKO__SMTP__SERVER