make: update Go to v1.23.6

The Go image is supposedly updated by Renovate. However, by being too
specific with the Alpine version, we stopped getting updates as an
Alpine v3.19 image is no longer being published. To avoid this issue,
let's simply specify `-alpine` as the image without specifying the
version. There's no point in being too specific as we do not use this
image for a multi-strage docker build.

Signed-off-by: Robin Hahling <[email protected]>

Makefile

@@ -24,8 +24,8 @@ RENOVATE_GITHUB_COM_TOKEN ?= $(shell gh auth token)
 TEST_TIMEOUT ?= 5s
 
 # renovate: datasource=docker depName=library/golang
-GOLANG_IMAGE_VERSION = 1.23.4-alpine3.19
-GOLANG_IMAGE_SHA = sha256:5f3336882ad15d10ac1b59fbaba7cb84c35d4623774198b36ae60edeba45fd84
+GOLANG_IMAGE_VERSION = 1.23.6-alpine
+GOLANG_IMAGE_SHA = sha256:2c49857f2295e89b23b28386e57e018a86620a8fede5003900f2d138ba9c4037
 
 # Add the ability to override variables
 -include Makefile.override