V3.1: Adapt Value_type_IEC_61360 length to 2048

Previously, the invariant declaring the maximum
length of `Value_type_IEC_61360` was set to
`2000`. Decided in [aas-specs#306] and specified
in [aas-specs-iec61360#21] this was adapted to
`2048`.

We therefore adapt the invariant to a maximum
length of `2048`

[aas-specs#306](admin-shell-io/aas-specs#306)
[aas-specs-iec61360#21](admin-shell-io/aas-specs-iec61360#21)

aas_core_meta/v3_1.py

@@ -1280,8 +1280,8 @@ class Identifier(Non_empty_XML_serializable_string, DBC):
 
 
 @invariant(
-    lambda self: len(self) <= 2000,
-    "Value type IEC 61360 shall have a maximum length of 2000 characters.",
+    lambda self: len(self) <= 2048,
+    "Value type IEC 61360 shall have a maximum length of 2048 characters.",
 )
 class Value_type_IEC_61360(Non_empty_XML_serializable_string):
     """