chore(deps): update dependency go

Author: renovate[bot]

.github/workflows/backend-ci.yaml

@@ -24,7 +24,7 @@ jobs:
       - uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4
       - uses: actions/setup-go@93397bea11091df50f3d7e59dc26a7711a8bcfbe # v4
         with:
-          go-version: "1.21.13"
+          go-version: "1.24.1"
       - run: go mod download
       - name: Firestore Emulator
         run: docker run -d -p 9000:9000 gcr.io/google.com/cloudsdktool/cloud-sdk:emulators gcloud emulators firestore start --host-port=0.0.0.0:9000
@@ -46,7 +46,7 @@ jobs:
       - uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4
       - uses: actions/setup-go@93397bea11091df50f3d7e59dc26a7711a8bcfbe # v4
         with:
-          go-version: "1.21.13"
+          go-version: "1.24.1"
       - name: golangci-lint
         uses: golangci/golangci-lint-action@3a919529898de77ec3da873e3063ca4b10e7f5cc # v3
         with:

backend/go.mod

@@ -2,7 +2,7 @@ module github.com/nownabe/golink/backend
 
 go 1.23.0
 
-toolchain go1.23.6
+toolchain go1.24.2
 
 require (
 	cloud.google.com/go/compute/metadata v0.6.0