ci: add depguard

Signed-off-by: knqyf263 <[email protected]>

.golangci.yaml

@@ -1,4 +1,16 @@
 linters-settings:
+  depguard:
+    rules:
+      main:
+        list-mode: lax
+        deny:
+          - pkg: "io/ioutil"
+            desc: "Replaced by 'io' and 'os' packages since Go 1.16: https://tip.golang.org/doc/go1.16#ioutil"
+          # Cannot use gomodguard, which examines go.mod, as "golang.org/x/exp/slices" is not a module and doesn't appear in go.mod.
+          - pkg: "golang.org/x/exp/slices"
+            desc: "Use 'slices' instead"
+          - pkg: "golang.org/x/exp/maps"
+            desc: "Use 'maps' instead"
   dupl:
     threshold: 100
   errcheck:
@@ -81,6 +93,7 @@ linters:
   disable-all: true
   enable:
     - bodyclose
+    - depguard
     - gci
     - goconst
     - gocritic