fixup: update submodule info

Signed-off-by: Simon Schrottner <[email protected]>

Author: aepfli

.gitmodules

@@ -8,4 +8,4 @@
 [submodule "providers/openfeature-provider-flagd/openfeature/test-harness"]
 	path = providers/openfeature-provider-flagd/openfeature/test-harness
 	url = https://github.com/open-feature/flagd-testbed.git
-	branch = v2.8.0
+	branch = v2.10.2