community/squeekboard: upgrade to 1.9.3

Remove the custom terminal layout again. This was merged into upstream,
but then replaced upstream with yet another default terminal layout.
Let's stick with upstream default.

Related: https://source.puri.sm/Librem5/squeekboard/-/merge_requests/345
Related: https://source.puri.sm/Librem5/squeekboard/-/merge_requests/368
7 jobs for !11336 with squeekboard-upgrade in 44 seconds (queued for 1 second)
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Status Job ID Name Coverage
  Lint
passed #184580
docker-alpine x86_64
lint

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  Build
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docker-alpine ci-build aarch64
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docker-alpine ci-build armv7
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docker-alpine ci-build ppc64le
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docker-alpine ci-build s390x
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docker-alpine ci-build x86
build-x86

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docker-alpine ci-build x86_64
build-x86_64

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