CI: use upstream gokrazy/tools to fix build errors

The consolving/gokrazy-tools fork uses removed functions
(config.InstanceConfigPath, config.ApplyInstanceFlag) from
gokrazy/internal/config, causing compilation failures.
Use upstream gokrazy/tools which has these fixed.

Author: phaus

.github/workflows/build-image.yml

@@ -27,18 +27,12 @@ jobs:
         with:
           path: kernel-a20
 
-      - name: Check out tools (consolving fork)
+      - name: Check out tools
         uses: actions/checkout@v4
         with:
-          repository: consolving/gokrazy-tools
+          repository: gokrazy/tools
           path: tools
 
-      - name: Check out internal (consolving fork)
-        uses: actions/checkout@v4
-        with:
-          repository: consolving/gokrazy-internal
-          path: internal
-
       - name: Set up Go
         uses: actions/setup-go@v5
         with: