Fix mamba/conda version test

tests/conda/py35-binder-dir/verify

@@ -16,13 +16,13 @@ v = out.split()[1]
 assert v[:3] == "3.5", out
 
 out = sh(["micromamba", "--version"])
-assert out == "1.4.9", out
+assert out == "1.5.1", out
 
 out = sh(["mamba", "--version"])
 assert (
     out
-    == """mamba 1.4.9
-conda 23.5.2"""
+    == """mamba 1.5.1
+conda 23.7.4"""
 ), out
 
 sh([kernel_python, "-c", "import numpy"])