run go mod tidy on tooling/go.mod and downgrade docker image (#3835)

Addresses flutter/flutter#152394 Last build failed with an error message to run `go mod tidy`, which i did on //tooling/go.mod. Also downgraded docker image to golang:1.21 since that's what upstream slsa-verifier uses.
flutter · Jul 26, 2024 · 3d83df5 · 3d83df5
1 parent f1b20b6
commit 3d83df5
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diff --git a/app_dart/cloudbuild_app_dart_deploy.yaml b/app_dart/cloudbuild_app_dart_deploy.yaml
@@ -18,7 +18,7 @@ steps:
 
   # Verify provenance is valid before proceeding with deployment.
   # This name is a dockerhub tag
-  - name: 'golang:1.22.5-bookworm'
+  - name: 'golang:1.21.12-bookworm'
     entrypoint: '/bin/bash'
     args:
       - '-c'

diff --git a/tooling/go.mod b/tooling/go.mod
@@ -1,6 +1,8 @@
 module cocoon-tooling
 
-go 1.18
+go 1.21
+
+toolchain go1.21.4
 
 require github.com/slsa-framework/slsa-verifier/v2 v2.6.0