[Deps] Update qonnx commit version to incorporate doc string changes

fetch-repos.sh

@@ -27,7 +27,7 @@
 # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-QONNX_COMMIT="f702b17cdb9d5e57f85f43a5d33890647e063de6"
+QONNX_COMMIT="7d50273a4dcccb445fb06f57f6bedc17b3707b35"
 FINN_EXP_COMMIT="9cbd2787b5160e2b44e0e8164a0df1457dbd5366"
 BREVITAS_COMMIT="a5b71d6de1389d3e7db898fef72e014842670f03"
 PYVERILATOR_COMMIT="766e457465f5c0dd315490d7b9cc5d74f9a76f4f"