Fix/gh copilot apiversion (#8826)

* fix: changed apiversion of gh copilot as per the docs

* fix: added test and a const for testable version

Author: saysamit

backend/plugins/gh-copilot/service/connection_test_helper.go

@@ -73,7 +73,7 @@ func TestConnection(ctx stdctx.Context, br corectx.BasicRes, connection *models.
 	}
 	apiClient.SetHeaders(map[string]string{
 		"Accept":               "application/vnd.github+json",
-		"X-GitHub-Api-Version": "2022-11-28",
+		"X-GitHub-Api-Version": "2026-03-10",
 	})
 
 	result := &TestConnectionResult{

backend/plugins/gh-copilot/tasks/api_client.go

@@ -28,6 +28,8 @@ import (
 	"github.com/apache/incubator-devlake/plugins/gh-copilot/models"
 )
 
+const gitHubApiVersion = "2026-03-10"
+
 type nowFunc func() time.Time
 type sleepFunc func(time.Duration)
 
@@ -65,7 +67,7 @@ func CreateApiClient(taskCtx plugin.TaskContext, connection *models.GhCopilotCon
 
 	apiClient.SetHeaders(map[string]string{
 		"Accept":               "application/vnd.github+json",
-		"X-GitHub-Api-Version": "2022-11-28",
+		"X-GitHub-Api-Version": gitHubApiVersion,
 	})
 
 	rateLimiter := &helper.ApiRateLimitCalculator{UserRateLimitPerHour: connection.RateLimitPerHour}

backend/plugins/gh-copilot/tasks/api_client_test.go

@@ -75,3 +75,8 @@ func TestHandleGitHubRetryAfterNoopOnNon429(t *testing.T) {
 	require.Equal(t, time.Duration(0), slept)
 	require.Len(t, logger.warnings, 0)
 }
+
+func TestGitHubApiVersionHeaderValue(t *testing.T) {
+	require.Equal(t, "2026-03-10", gitHubApiVersion,
+		"GitHub API version header was changed; verify the new version is supported and update this test")
+}