Update knowhere commit (#26049)

Co-authored-by: Ngithub-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

internal/core/thirdparty/knowhere/CMakeLists.txt

@@ -11,7 +11,7 @@
 # or implied. See the License for the specific language governing permissions and limitations under the License.
 #-------------------------------------------------------------------------------
 
-set( KNOWHERE_VERSION 4acecef )
+set( KNOWHERE_VERSION b7d0b0a )
 
 message(STATUS "Building knowhere-${KNOWHERE_SOURCE_VER} from source")
 message(STATUS ${CMAKE_BUILD_TYPE})