fix(logp): TestConfigureWithCore fails with Go 1.24 (elastic#233)

The cmd/vet in Go 1.24 reports printf calls with non-const format and no
args, causing one test in logp to fail.

See golang/go#60529.

```
$ go install golang.org/dl/gotip@latest
$ gotip download
$ gotip test ./logp -count=1
logp/core_test.go:714:7: non-constant format string in call to github.com/elastic/elastic-agent-libs/logp.Info
FAIL    github.com/elastic/elastic-agent-libs/logp [build failed]
```

kibana/fleet.go

@@ -78,6 +78,7 @@ type AgentPolicy struct {
 	UnenrollTimeout    int                       `json:"unenroll_timeout,omitempty"`
 	InactivityTImeout  int                       `json:"inactivity_timeout,omitempty"`
 	AgentFeatures      []map[string]interface{}  `json:"agent_features,omitempty"`
+	Overrides          []map[string]interface{}  `json:"overrides,omitempty"`
 	IsProtected        bool                      `json:"is_protected"`
 }
 
@@ -110,6 +111,7 @@ type AgentPolicyUpdateRequest struct {
 	UnenrollTimeout    int                       `json:"unenroll_timeout,omitempty"`
 	InactivityTImeout  int                       `json:"inactivity_timeout,omitempty"`
 	AgentFeatures      []map[string]interface{}  `json:"agent_features,omitempty"`
+	Overrides          []map[string]interface{}  `json:"overrides,omitempty"`
 	IsProtected        *bool                     `json:"is_protected,omitempty"` // Optional bool for compatibility with the older pre 8.9.0 stack
 }
 

logp/core_test.go

@@ -711,7 +711,7 @@ func TestConfigureWithCore(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Unexpected err: %s", err)
 	}
-	Info(testMsg)
+	Info("The quick brown %s jumped over the lazy %s.", "fox", "dog")
 	var r map[string]interface{}
 
 	err = json.Unmarshal(b.Bytes(), &r)