fix(deps): update copier template to v2.18.6

This MR contains the following updates:

Package	Type	Update	Change
https://gitlab.developers.cam.ac.uk/uis/devops/webapp-boilerplate.git	template	minor	2.14.5 -> 2.18.6

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Release Notes

uis/devops/webapp-boilerplate (https://gitlab.developers.cam.ac.uk/uis/devops/webapp-boilerplate.git)

v2.18.6

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v2.18.5

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v2.18.4

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v2.18.3

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Bug Fixes

• work around poetry hanging trying to run poetry lock (176b420)

v2.18.2

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v2.18.1

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v2.18.0

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Features

• README: add link to guidebook docs for usage (e298ca6)

v2.17.1

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v2.17.0

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Features

• let renovate pin version of postgres used in CI and local dev (d8c80da)

v2.16.0

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Features

• migrate remainder of pyproject.toml to new-style (b2ef2de)

Bug Fixes

• tests: specify vcs-ref of HEAD when running tests (6aa366e)

v2.15.0

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Features

• switch over to requires-python (838f4de)

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