Merge branch 'erikj/fix_sqlite_7' of github.com:matrix-org/synapse into release-v1.7.0

changelog.d/6497.bugfix

changelog.d/6499.bugfix

synapse/rest/client/v1/profile.py

synapse/storage/data_stores/main/events.py

synapse/storage/data_stores/main/events_bg_updates.py

...age/data_stores/main/schema/delta/56/redaction_censor.sql

...ge/data_stores/main/schema/delta/56/redaction_censor2.sql

...ge/data_stores/main/schema/delta/56/redaction_censor4.sql