Phase out OrderedDict usage since xmltodict 0.13 no longer uses it

Signed-off-by: Andrej Shadura <andrew.shadura@collabora.co.uk>

obs_proxy/worker.py

@@ -86,11 +86,11 @@ class Worker:
         ... </worker>''')
         Worker(port=1234, hostarch='armv8l', ip='1.2.3.4',
             meta={'linux':
-                OrderedDict([('version', '4.19.0-14'),
-                             ('flavor', 'arm64')]),
+                  {'version': '4.19.0-14',
+                   'flavor': 'arm64'},
                 'hardware':
-                  OrderedDict([('cpu', None),
-                               ('processors', '8')])},
+                  {'cpu': None,
+                   'processors': '8'}},
             workerid='worker-1:1')
         >>> Worker.fromxml('''
         ... <worker hostarch="aarch64" ip="4.3.2.1" port="4321" workerid="worker-2:2">
@@ -110,11 +110,11 @@ class Worker:
         Worker(port=4321, hostarch='aarch64', ip='4.3.2.1',
             meta={'sandbox': 'chroot',
                   'linux':
-                    OrderedDict([('version', '4.19.0-5'),
-                                 ('flavor', 'arm64')]),
+                    {'version': '4.19.0-5',
+                     'flavor': 'arm64'},
                   'hardware':
-                    OrderedDict([('cpu', None),
-                                 ('processors', '24')]),
+                    {'cpu': None,
+                     'processors': '24'},
                   'job': 'debian:bookworm::default::systemd-4834c55cd01c5ef054f079c3af4f9533',
                   'arch': 'aarch64',
                   'jobid': '211438592abc7892a636a711f9dc339c'},

setup.cfg

@@ -28,7 +28,7 @@ install_requires =
     json-rpc ~= 1.12
     Quart >= 0.11, < 0.18
     websockets ~= 10.0
-    xmltodict ~= 0.12
+    xmltodict ~= 0.13
     aiofiles ~= 0.8
     jinja2 ~= 3.0.0
 tests_require = obs-proxy[test]