Update dependency allotment to v1.20.4

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This PR contains the following updates:

Package	Change	Age	Confidence
allotment (source)	1.19.2 -> 1.20.4
allotment (source)	1.20.1 -> 1.20.4

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Release Notes

johnwalley/allotment (allotment)

v1.20.4

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Bug Fixes

• stop low priority panels resizing first when visibility of panes is changed (#​857) (704f6b5)

v1.20.3

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Bug Fixes

• deps: add react 19 as a peer dependency (da58743)

v1.20.2

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Bug Fixes

• remove code to initialize dimensions before first paint (#​805) (3657e2d)

v1.20.1

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Bug Fixes

• correct dist exports condition (#​784) (90b75d2)

v1.20.0

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Features

• allow customising sash animation duration (#​740) (e92b944)

v1.19.5

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Bug Fixes

• allow setting id on split-view component (#​752) (d23cf34)

v1.19.4

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Bug Fixes

• improve esm support (0512d71)

1.19.3 (2023-08-23)

Bug Fixes

• sash-disabled class name typo (#​676) (73c2115)

1.19.2 (2023-07-17)

1.19.1 (2023-07-17)

Bug Fixes

• forward ref to underlying Pane dom element (#​632) (574c1ef)

v1.19.3

Compare Source

Bug Fixes

• improve esm support (0512d71)

1.19.3 (2023-08-23)

Bug Fixes

• sash-disabled class name typo (#​676) (73c2115)

1.19.2 (2023-07-17)

1.19.1 (2023-07-17)

Bug Fixes

• forward ref to underlying Pane dom element (#​632) (574c1ef)

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