Fix the nanovdb Python bindings against nanovdb's own 13.0.0 API.

USE=python does not build without this: nanovdb_python fails on two files,
both because the bindings were left behind by API changes in the same release.

  PyIO.cc:42            'padding' is not a member of 'nanovdb::io::FileMetaData'
  PyNanoToOpenVDB.cc:24 no matching function for call to
                        'nanoToOpenVDB<HostBuffer>(GridHandle<HostBuffer>&, int&, uint32_t&)'

FileMetaData (NanoVDB.h:5844) replaced the 'padding' field with
'blindDataCount', and tools::nanoToOpenVDB (NanoToOpenVDB.h:87) is now
(handle, gridID) with no 'verbose' argument.

Both are already fixed in upstream master; this is a backport of just the API
changes, without master's added docstrings, to keep the patch minimal.  Expect
it to stop applying at the next release that carries the fix -- eapply dies on
a context mismatch, which is the intended signal to drop this file rather than
to force it.
--- a/nanovdb/nanovdb/python/PyIO.cc
+++ b/nanovdb/nanovdb/python/PyIO.cc
@@ -39,7 +39,7 @@
         .def_prop_ro("tileCount",
                      [](io::FileMetaData& metaData) { return std::make_tuple(metaData.tileCount[0], metaData.tileCount[1], metaData.tileCount[2]); })
         .def_ro("codec", &io::FileMetaData::codec)
-        .def_ro("padding", &io::FileMetaData::padding)
+        .def_ro("blindDataCount", &io::FileMetaData::blindDataCount)
         .def_ro("version", &io::FileMetaData::version);
 
     nb::bind_vector<std::vector<io::FileMetaData>>(m, "FileMetaDataVector");
--- a/nanovdb/nanovdb/python/PyNanoToOpenVDB.cc
+++ b/nanovdb/nanovdb/python/PyNanoToOpenVDB.cc
@@ -20,9 +20,9 @@
 #ifdef NANOVDB_USE_OPENVDB
     // Wrap nanoToOpenVDB into a lambda to workaround an MSVC compiler bug
     m.def(
-        "nanoToOpenVDB", [](GridHandle<BufferT>& handle, int verbose, uint32_t n){
-            return tools::nanoToOpenVDB<BufferT>(handle, verbose, n);
-        }, "handle"_a, "verbose"_a = 0, "n"_a = 0);
+        "nanoToOpenVDB", [](GridHandle<BufferT>& handle, uint32_t n){
+            return tools::nanoToOpenVDB<BufferT>(handle, n);
+        }, "handle"_a, "n"_a = 0);
 #endif
 }