v4.3 update. (#2709)

* v4.3 update.

* Update the cute_dsl_api changelog's doc link

* Update version to 4.3.0

* Update the example link

* Update doc to encourage user to install DSL from requirements.txt

---------

Co-authored-by: Larry Wu <larwu@nvidia.com>

examples/python/CuTeDSL/blackwell/mamba2_ssd/mamba2_ssd_reference.py

@@ -212,7 +212,7 @@ def analyze_relative_diffs(actual, expected):
     )
 
     # Print max relative difference info
-    print(f"Maximum relative difference:")
+    print("Maximum relative difference:")
     print(f"Position: {max_rel_diff_pos}")
     print(f"Value: {max_rel_diff:.6e}")
     print(f"Actual value: {actual.flatten()[max_rel_diff_pos]}")
@@ -236,7 +236,7 @@ def analyze_relative_diffs(actual, expected):
             print(f"Elements with rtol <= {rtol:.0e}: {count} ({percentage:.2f}%)")
         else:
             print(
-                f"Elements with {rtol_levels[i-1]:.0e} < rtol <= {rtol:.0e}: {count} ({percentage:.2f}%)"
+                f"Elements with {rtol_levels[i - 1]:.0e} < rtol <= {rtol:.0e}: {count} ({percentage:.2f}%)"
             )
 
     # Print elements exceeding the largest rtol