Bump to OCCT 8.0.1

Four mechanical binding edits; the bound Python surface is unchanged
(sigdiff compared the 7.9.3.1 dump against 8.0.1.1's in both directions
and found no class, member or constructor arity moved), so the app needs
no change.

- NCollection_Utf8String is gone; NCollection_String is the same UTF-8
  type. Python name kept, since the app imports it.
- Standard_Failure lost its Standard_Transient RTTI when it moved to
  deriving std::exception; ExceptionType() replaced DynamicType()->Name()
  and returns the same class names the exception dispatch keys on.
- FindKey gained a size_t overload beside the int one, so the plain
  member pointer is ambiguous; overload_cast picks the int form, which
  keeps the negative-index guard.
- StdPrs moved from TKService to TKV3d, so CMakeLists links both.

The byte-identity fixtures did NOT retire, contrary to the watchlist:
all six round-trip to the same digests under the new kernel, as do the
measurement, history and mesh-count blocks, so tests/data is untouched
and the app's content-addressed BREP payloads stay valid.

Gates: binding suite 83 passed, 138/138 symbols, sigdiff clean both
directions, ASAN clean, app suite 1798 passed / 1 skipped (unchanged),
sweep over 4486 parts with anchors_digest and every status unchanged,
-m perf 16% faster on the 32-feature chain.

src/modules/mod_GeomLProp.cpp

@@ -4,9 +4,9 @@
     One use: text emboss reads the surface normal at the anchor's UV to decide
     which way the glyph solid grows out of a curved face.
 
-    OCCT 8.0 supersedes this package with GeomProp/BRepProp (results come back
-    as structs carrying IsDefined flags instead of throwing).  Only Normal()
-    is bound, so the port is a one-line move — see design.md's 8.0 watchlist.
+    OCCT 8.0 rebuilt this as a template — GeomLProp_SLProps is now an alias for
+    GeomLProp_SLPropsBase<handle<Geom_Surface>> — but kept the constructor and
+    the accessors we bind, so the surface below is unchanged.
 */
 
 #include "../common/occt_module.h"