Bump Go to 1.25.0 (#242)

* Bump Go to 1.25.0

* Fix golangci-lint warning

Author: roger2hk

.github/workflows/go_test.yml

@@ -6,7 +6,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [ '1.24.x', '1.25.x' ]
+        go-version: [ '1.25.x', '1.26.x' ]
         os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:

.github/workflows/golangci-lint.yml

@@ -18,5 +18,5 @@ jobs:
       - name: golangci-lint
         uses: golangci/golangci-lint-action@1e7e51e771db61008b38414a730f564565cf7c20 # v9.2.0
         with:
-          version: v2.1.6
+          version: v2.11.4
           args: --timeout=8m

go.mod

@@ -1,6 +1,6 @@
 module github.com/transparency-dev/formats
 
-go 1.24.0
+go 1.25.0
 
 require (
 	github.com/google/go-cmp v0.7.0

log/checkpoint_test.go

@@ -172,7 +172,7 @@ type moonLogCheckpoint struct {
 func (m moonLogCheckpoint) Marshal() []byte {
 	b := bytes.Buffer{}
 	b.Write(m.Checkpoint.Marshal())
-	b.WriteString(fmt.Sprintf("%x\n%s\n", m.Timestamp, m.Phase))
+	fmt.Fprintf(&b, "%x\n%s\n", m.Timestamp, m.Phase)
 	return b.Bytes()
 }