fix: multiple field annotations bugfix

[dapper91]

Adds support for multiple field type annotations.

See the following example:

from typing import Annotated

import pydantic_xml as pxml
from annotated_types import Ge, Le


CompanyElement = pxml.element(ns='co', nsmap={'co': 'http://company-ns.com'})


class Company(pxml.BaseXmlModel, tag='Company'):
    founded: Annotated[int, Ge(ge=0), Le(le=2025), CompanyElement] = pxml.element(tag='foundYear')


xml = '''
<Company xmlns:co="http://company-ns.com">
    <co:foundYear>2020</co:foundYear>
</Company>
'''

print(Company.from_xml(xml))

Fixes the issue

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 99.21875% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.31%. Comparing base (32e205c) to head (8d92470).

Files with missing lines	Patch %	Lines
pydantic_xml/fields.py	99.11%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #268      +/-   ##
==========================================
+ Coverage   92.15%   92.31%   +0.15%     
==========================================
  Files          29       30       +1     
  Lines        1695     1730      +35     
==========================================
+ Hits         1562     1597      +35     
  Misses        133      133              

Flag	Coverage Δ
unittests	92.31% <99.21%> (+0.15%)	⬆️

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