fix: CI lint silently breaks whenever a new Go stable is released

.github/workflows/go.yml

@@ -30,7 +30,7 @@ jobs:
         submodules: recursive
 
     - name: Lint
-      uses: golangci/golangci-lint-action@v6
+      uses: golangci/golangci-lint-action@v9
 
     - name: Build
       run: go build -v ./...

.golangci.yml

@@ -1,25 +1,25 @@
-linters-settings:
-  misspell:
-    locale: UK
-    ignore-words:
-      - standardize  # hujson library uses US spelling
+version: "2"
 linters:
+  default: none
   enable:
     - contextcheck
     - errcheck
     - godot
-    - gofmt
-    - goimports
-    - gosimple
     - govet
     - ineffassign
     - misspell
     - staticcheck
     - unused
     - whitespace
-  disable-all: true
+  settings:
+    misspell:
+      locale: UK
+      ignore-rules:
+        - standardize  # hujson library uses US spelling
 issues:
   max-issues-per-linter: 0
   max-same-issues: 0
-run:
-  timeout: 5m
+formatters:
+  enable:
+    - gofmt
+    - goimports

flagengine/utils/time.go

@@ -17,5 +17,5 @@ func (i *ISOTime) UnmarshalJSON(bytes []byte) (err error) {
 }
 
 func (i *ISOTime) MarshalJSON() ([]byte, error) {
-	return []byte(`"` + i.Time.Format(time.RFC3339) + `"`), nil
+	return []byte(`"` + i.Format(time.RFC3339) + `"`), nil
 }

realtime.go

@@ -64,7 +64,7 @@ func (r *realtime) connect() error {
 	if err != nil {
 		return err
 	}
-	defer resp.Body.Close()
+	defer func() { _ = resp.Body.Close() }()
 	if resp.StatusCode != http.StatusOK {
 		return fmt.Errorf("error response connecting to stream: %d", resp.StatusCode)
 	}