Core: Upgrade SQLAlchemy to version 1.4

[Daverball]

Commit message

Core: Upgrade SQLAlchemy to version 1.4

TYPE: Feature
LINK: OGC-15

Checklist

• I have performed a self-review of my code
• I have tested my code thoroughly by hand
• I have added tests for my changes/features

[linear]

OGC-15 SQLAlchemy >1.4

[codecov]

Codecov Report

❌ Patch coverage is 95.75758% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.37%. Comparing base (b829bbf) to head (7daaa07).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/onegov/org/views/allocation.py	0.00%	2 Missing ⚠️
src/onegov/activity/collections/booking.py	75.00%	1 Missing ⚠️
src/onegov/core/custom/custom_msgpack.py	91.66%	1 Missing ⚠️
src/onegov/core/orm/session_manager.py	98.21%	1 Missing ⚠️
src/onegov/form/collection.py	50.00%	1 Missing ⚠️
src/onegov/org/models/extensions.py	88.88%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
src/onegov/activity/collections/activity.py	93.60% <100.00%> (+0.24%)	⬆️
src/onegov/activity/matching/score.py	99.09% <ø> (ø)
src/onegov/activity/models/attendee.py	97.53% <ø> (ø)
src/onegov/activity/models/occasion.py	99.40% <100.00%> (ø)
src/onegov/activity/models/period.py	93.82% <100.00%> (ø)
src/onegov/chat/collections/message.py	98.14% <100.00%> (ø)
src/onegov/chat/models/message.py	93.61% <100.00%> (-2.13%)	⬇️
src/onegov/core/orm/func.py	100.00% <100.00%> (ø)
src/onegov/core/orm/mixins/publication.py	100.00% <100.00%> (ø)
src/onegov/core/orm/types/json_type.py	100.00% <100.00%> (ø)
... and 54 more

... and 2 files with indirect coverage changes

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