Use gdal.WarpOptions when merging rasters (#303)

* While running notebooks on azure, I ran into a `zero positional`
argument error from gdal.Warp when called from common.merge_rasters.

In looking at the code, I changed to using gdal.WarpOptions which
resolved the error.

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---------

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samgeo/common.py

@@ -2992,16 +2992,20 @@ def merge_rasters(
         raise ImportError(
             "GDAL is required to use this function. Install it with `conda install gdal -c conda-forge`"
         )
+
     # Get a list of all the input files
     input_files = glob.glob(os.path.join(input_dir, input_pattern))
 
+    # Prepare the gdal.Warp options
+    warp_options = gdal.WarpOptions(
+        format=output_format, dstNodata=output_nodata, creationOptions=output_options
+    )
+
     # Merge the input files into a single output file
     gdal.Warp(
-        output,
-        input_files,
-        format=output_format,
-        dstNodata=output_nodata,
-        options=output_options,
+        destNameOrDestDS=output,
+        srcDSOrSrcDSTab=input_files,
+        options=warp_options,
     )