chore: add float32 scalar kernel of log1p in unary function database

PR-URL: #9452
Reviewed-by: Athan Reines <kgryte@gmail.com>

Author: gunjjoshi

lib/node_modules/@stdlib/math/special/data/unary_function_database.json

@@ -1887,6 +1887,7 @@
     ],
     "primary_dtype": "float64",
     "scalar_kernels": {
+      "float32": "@stdlib/math/base/special/log1pf",
       "float64": "@stdlib/math/base/special/log1p",
       "generic": "@stdlib/math/base/special/log1p"
     },