Update dependency xmltodict to v0.15.1 (#463)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

confbatstest/requirements.txt

@@ -93,9 +93,9 @@ tomlkit==0.13.3 \
     # via
     #   -r requirements.in
     #   yq
-xmltodict==0.14.2 \
-    --hash=sha256:201e7c28bb210e374999d1dde6382923ab0ed1a8a5faeece48ab525b7810a553 \
-    --hash=sha256:20cc7d723ed729276e808f26fb6b3599f786cbc37e06c65e192ba77c40f20aac
+xmltodict==0.15.1 \
+    --hash=sha256:3d8d49127f3ce6979d40a36dbcad96f8bab106d232d24b49efdd4bd21716983c \
+    --hash=sha256:dcd84b52f30a15be5ac4c9099a0cb234df8758624b035411e329c5c1e7a49089
     # via
     #   -r requirements.in
     #   yq