Bump immutables from 0.19 to 0.20 in /back-end

[dependabot[bot]]

Bumps immutables from 0.19 to 0.20.

Release notes

Sourced from immutables's releases.

v0.20

Changes

• Enable support for pattern matching (#96) (by @​antonagestam in 7071a24d)

• add support for aix/sunos (#98) (by @​mattp- in 765e4ee0)

• Python 3.12 compatibility (#105) (by @​elprans in f7978225)

• Add contains to MapKeys (#99) (by @​msullivan in 6790111e)

• Add PEP 585 GenericAlias support (#101) (by @​eltoder in 9ce64c53)

• Move metadata to pyproject.toml, fix test fixture inclusion in sdist (#111) (by @​elprans in ea656567 for)

Commits

• 4ccb970 immutables v0.20
• 5e6f2b7 Modernize the release workflow
• 2c4e7a6 Skip pattern-matching test on Python < 3.10
• 2f5861c Bump pythoncapi_compat and correct its license in LICENSE (#110)
• ea65656 Move metadata to pyproject.toml, fix test fixture inclusion in sdist (#111)
• 9ce64c5 Add PEP 585 GenericAlias support (#101)
• a952730 Fix indentation in setup.py (#106)
• 6790111 Add contains to MapKeys (#99)
• f797822 Python 3.12 compatibility (#105)
• 765e4ee add support for aix/sunos (#98)
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR: - `@dependabot rebase` will rebase this PR - `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it - `@dependabot merge` will merge this PR after your CI passes on it - `@dependabot squash and merge` will squash and merge this PR after your CI passes on it - `@dependabot cancel merge` will cancel a previously requested merge and block automerging - `@dependabot reopen` will reopen this PR if it is closed - `@dependabot close` will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually - `@dependabot show ignore conditions` will show all of the ignore conditions of the specified dependency - `@dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)

[codecov[bot]]

Codecov Report

Merging #389 (5f8c1ff) into dev (7274f10) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #389   +/-   ##
=======================================
  Coverage   99.77%   99.77%           
=======================================
  Files          28       28           
  Lines         883      883           
  Branches       48       48           
=======================================
  Hits          881      881           
  Misses          2        2