update go version to 1.21

Signed-off-by: hirokuni-kitahara <[email protected]>

.github/workflows/cross.yaml

@@ -14,7 +14,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v2
         with:
-          go-version: '1.19.x'
+          go-version: '1.21.x'
       - name: compile
         run: |
           make build
@@ -37,7 +37,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v2
         with:
-          go-version: '1.19.x'
+          go-version: '1.21.x'
       - name: Checkout code
         uses: actions/checkout@v2
       - name: Build

.github/workflows/slsa-goreleaser.yml

@@ -40,7 +40,7 @@ jobs:
     uses: slsa-framework/slsa-github-generator/.github/workflows/[email protected]
     with:
       config-file: .slsa-goreleaser-linux-amd64.yml
-      go-version: 1.19
+      go-version: 1.21
       evaluated-envs: "COMMIT_DATE:${{needs.args.outputs.commit-date}}, COMMIT:${{needs.args.outputs.commit}}, VERSION:${{needs.args.outputs.version}}, TREE_STATE:${{needs.args.outputs.tree-state}}"
 
   build-darwin-amd64:
@@ -52,7 +52,7 @@ jobs:
     uses: slsa-framework/slsa-github-generator/.github/workflows/[email protected]
     with:
       config-file: .slsa-goreleaser-darwin-amd64.yml
-      go-version: 1.19
+      go-version: 1.21
       evaluated-envs: "COMMIT_DATE:${{needs.args.outputs.commit-date}}, COMMIT:${{needs.args.outputs.commit}}, VERSION:${{needs.args.outputs.version}}, TREE_STATE:${{needs.args.outputs.tree-state}}"
 
   build-windows-amd64:
@@ -64,6 +64,6 @@ jobs:
     uses: slsa-framework/slsa-github-generator/.github/workflows/[email protected]
     with:
       config-file: .slsa-goreleaser-windows-amd64.yml
-      go-version: 1.19
+      go-version: 1.21
       evaluated-envs: "COMMIT_DATE:${{needs.args.outputs.commit-date}}, COMMIT:${{needs.args.outputs.commit}}, VERSION:${{needs.args.outputs.version}}, TREE_STATE:${{needs.args.outputs.tree-state}}"
 

.github/workflows/tests.yaml

@@ -42,7 +42,7 @@ jobs:
             ${{ runner.os }}-go-
       - uses: actions/setup-go@v2
         with:
-          go-version: '1.19.x'
+          go-version: '1.21.x'
       # - name: install ko
       #   run: |
       #     curl -L https://github.com/google/ko/releases/download/v0.8.3/ko_0.8.3_Linux_x86_64.tar.gz | tar xzf - ko && \
@@ -64,7 +64,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v2
         with:
-          go-version: '1.19.x'
+          go-version: '1.21.x'
       - name: Install addlicense
         run: go install github.com/google/addlicense@latest
       - name: Check license headers

go.mod

@@ -1,6 +1,6 @@
 module github.com/sigstore/k8s-manifest-sigstore
 
-go 1.19
+go 1.21
 
 require (
 	github.com/ProtonMail/go-crypto v0.0.0-20230923063757-afb1ddc0824c