chore(deps): align the SILO Go dependency stack

Standardize the related SILO components on Go 1.27 tooling, etcd 3.7.1, current Go-maintained modules, shared runtime versions, and explicit security and portability pins.

Keep the shared package Go 1.26 consumer floor, isolate lint tooling from product dependency selection, and preserve upstream-compatible import paths.

buildscripts/checkdeps.sh

@@ -7,7 +7,7 @@ _init() {
 
 	## Minimum required versions for build dependencies
 	GIT_VERSION="1.0"
-	GO_VERSION="1.16"
+	GO_VERSION="1.27.0"
 	OSX_VERSION="10.8"
 	KNAME=$(uname -s)
 	ARCH=$(uname -m)