fix: replace pow with expm1 dependency in triangular/mgf benchmark and examples

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---

Author: Planeshifter

lib/node_modules/@stdlib/stats/base/dists/triangular/mgf/manifest.json

@@ -59,7 +59,7 @@
         "@stdlib/math/base/assert/is-nan",
         "@stdlib/constants/float64/eps",
         "@stdlib/math/base/special/exp",
-        "@stdlib/math/base/special/pow"
+        "@stdlib/math/base/special/expm1"
       ]
     },
     {
@@ -77,7 +77,7 @@
         "@stdlib/math/base/assert/is-nan",
         "@stdlib/constants/float64/eps",
         "@stdlib/math/base/special/exp",
-        "@stdlib/math/base/special/pow"
+        "@stdlib/math/base/special/expm1"
       ]
     }
   ]