tast: fix go 1.26 vet breakages

Go >= 1.26.0 is stricter when formatting types and will not
automatically default to %v anymore when %q fails, so we need
to use %v explicitly to print complex types like maps.

Example error:
go.chromium.org/tast/core/cmd/tast
 * Vetting "go.chromium.org/tast/core/cmd/remote_test_runner/..."
 * Vetting "go.chromium.org/tast/core/cmd/tast/..."
src/go.chromium.org/tast/core/cmd/tast/internal/run/config/config_test.go:416:35: (*testing.common).Errorf format %q has arg got of wrong type map[go.chromium.org/tast/core/internal/debugger.DebugTarget]int

BUG=b:489125153
TEST=Local builds with Go 1.26.0; CQ.

Change-Id: Iec5e03cfa8cfacf88ab204932c8483090451216e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/tast/+/7627922
Reviewed-by: George Burgess <gbiv@chromium.org>
Reviewed-by: See Wai Fu <seewaifu@google.com>
Tested-by: Adrian Ratiu <adrian.ratiu@collabora.corp-partner.google.com>
Auto-Submit: Adrian Ratiu <adrian.ratiu@collabora.corp-partner.google.com>
Commit-Queue: Adrian Ratiu <adrian.ratiu@collabora.corp-partner.google.com>
diff --git a/src/go.chromium.org/tast/core/cmd/tast-lint/internal/git/git_test.go b/src/go.chromium.org/tast/core/cmd/tast-lint/internal/git/git_test.go
index 165e05b..485044e 100644
--- a/src/go.chromium.org/tast/core/cmd/tast-lint/internal/git/git_test.go
+++ b/src/go.chromium.org/tast/core/cmd/tast-lint/internal/git/git_test.go
@@ -156,7 +156,7 @@
 		{git.Added, symlinkName},
 		{git.Modified, testName},
 	}; !reflect.DeepEqual(fns, exp) {
-		t.Errorf("ChangedFiles() = %q; want %q", fns, exp)
+		t.Errorf("ChangedFiles() = %v; want %v", fns, exp)
 	}
 }
 
diff --git a/src/go.chromium.org/tast/core/cmd/tast/internal/run/config/config_test.go b/src/go.chromium.org/tast/core/cmd/tast/internal/run/config/config_test.go
index 9ba89b7..9cf98b5 100644
--- a/src/go.chromium.org/tast/core/cmd/tast/internal/run/config/config_test.go
+++ b/src/go.chromium.org/tast/core/cmd/tast/internal/run/config/config_test.go
@@ -413,7 +413,7 @@
 				t.Fatalf(`Unexpected error in %s: %s`, tc.name, err.Error())
 			}
 			if got := cfg.DebuggerPorts; !reflect.DeepEqual(got, tc.want) {
-				t.Errorf("cfg.DebuggerPorts = %q; want %q", got, tc.want)
+				t.Errorf("cfg.DebuggerPorts = %v; want %v", got, tc.want)
 			}
 		}
 	}
diff --git a/src/go.chromium.org/tast/core/internal/devserver/pseudo_test.go b/src/go.chromium.org/tast/core/internal/devserver/pseudo_test.go
index 246fa14..01427c4 100644
--- a/src/go.chromium.org/tast/core/internal/devserver/pseudo_test.go
+++ b/src/go.chromium.org/tast/core/internal/devserver/pseudo_test.go
@@ -87,6 +87,6 @@
 		t.Error("Get failed: ", err)
 	}
 	if resp.StatusCode != 404 {
-		t.Errorf("Get returned %q; want %q", resp.Status, 404)
+		t.Errorf("Get returned %v; want %v", resp.Status, 404)
 	}
 }