support golangci-lint v1.20.1 and v1.21.0

Author: jirfag

.golangci.yml

@@ -38,4 +38,4 @@ linters:
 # golangci.com configuration
 # https://github.com/golangci/golangci/wiki/Configuration
 service:
-  golangci-lint-version: 1.20.x # use fixed version to not introduce new linters unexpectedly
+  golangci-lint-version: 1.21.x # use fixed version to not introduce new linters unexpectedly

pkg/goenvbuild/preparer.go

@@ -37,11 +37,12 @@ var availableGolangciLintVersions = map[int]map[int][]int{
 		17: {0, 1},
 		18: {0},
 		19: {0, 1},
-		20: {0},
+		20: {0, 1},
+		21: {0},
 	},
 }
 
-const defaultGolangciLintVersion = "1.20.x"
+const defaultGolangciLintVersion = "1.21.x"
 
 type Preparer struct {
 	cfg config.Config