chore: update Go toolchain to 1.27 (#71)

Bump go directive to 1.27.0 (implies toolchain go1.27.0) and CI setup-go to
1.27.0; go mod tidy under 1.27.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: antoinetoussaint-byte

go.mod

@@ -1,8 +1,6 @@
 module github.com/codefly-dev/service-python
 
-go 1.26
-
-toolchain go1.26.6
+go 1.27.0
 
 require (
 	github.com/codefly-dev/core v0.3.4