Enable 'makezero' and 'prealloc' linters, and require 'any' instead of 'interface{}'

Enforce importas:

- go.pinniped.dev/generated/latest/apis/supervisor/config/v1alpha1
- go.pinniped.dev/generated/latest/apis/supervisor/idp/v1alpha1

internal/controller/authenticator/authncache/cache.go

@@ -1,4 +1,4 @@
-// Copyright 2020-2021 the Pinniped contributors. All Rights Reserved.
+// Copyright 2020-2024 the Pinniped contributors. All Rights Reserved.
 // SPDX-License-Identifier: Apache-2.0
 
 // Package authncache implements a cache of active authenticators.
@@ -65,7 +65,7 @@ func (c *Cache) Delete(key Key) {
 // Keys currently stored in the cache.
 func (c *Cache) Keys() []Key {
 	var result []Key
-	c.cache.Range(func(key, _ interface{}) bool {
+	c.cache.Range(func(key, _ any) bool {
 		result = append(result, key.(Key))
 		return true
 	})

internal/controller/authenticator/authncache/cache_test.go

@@ -184,7 +184,7 @@ func TestAuthenticateTokenCredentialRequest(t *testing.T) {
 
 type audienceFreeContext struct{}
 
-func (audienceFreeContext) Matches(in interface{}) bool {
+func (audienceFreeContext) Matches(in any) bool {
 	ctx, isCtx := in.(context.Context)
 	if !isCtx {
 		return false