Ensure emails are canonicalized before fetching associated user. (#11547)

This should fix pushers with an email in non-canonical form is used as
the pushkey.

1 files changed, 1 insertions, 0 deletions

diff --git a/changelog.d/11547.bugfix b/changelog.d/11547.bugfix
new file mode 100644

index 0000000000..3950c4c8d3
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+Fix a bug introduced in Synapse 1.17.0 where a pusher created for an email with capital letters would fail to be created.