Bump Golang to 1.21.3

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
       - name: Setup Golang
         uses: actions/setup-go@v4
         with:
-          go-version: ~1.20.7
+          go-version: ~1.21.3
 
       - uses: actions/cache@v3
         with:

.github/workflows/release.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Setup Golang
         uses: actions/setup-go@v4
         with:
-          go-version: ~1.20.7
+          go-version: ~1.21.3
 
       - uses: actions/cache@v3
         with:

.github/workflows/test.yml

@@ -12,7 +12,7 @@ jobs:
       - name: Setup Golang
         uses: actions/setup-go@v4
         with:
-          go-version: ~1.20.7
+          go-version: ~1.21.3
 
       - uses: actions/cache@v3
         with:

go.mod

@@ -1,6 +1,6 @@
 module github.com/aerokube/images
 
-go 1.20
+go 1.21
 
 require (
 	github.com/aandryashin/matchers v0.0.0-20161126170413-435295ea180e