workflows: bump GO_VERSION to 1.23.12

Author: mohamedawnallah

.github/workflows/main.yml

@@ -22,7 +22,7 @@ env:
   GOPATH: /home/runner/work/go
   GO111MODULE: on
 
-  GO_VERSION: 1.22.x
+  GO_VERSION: 1.23.12
   BITCOIND_VERSION: '22.0'
   BITCOIND_IMAGE: 'lightninglabs/bitcoin-core'