Revert "main/vala: upgrade to 0.48.10"

This reverts commit 07936499.
7 jobs for !12170 with vala in 19 minutes and 51 seconds
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Status Job ID Name Coverage
  Lint
passed #201772
x86_64 docker-alpine
lint

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  Build
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aarch64 ci-build docker-alpine
build-aarch64

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passed #201778
armv7 ci-build docker-alpine
build-armv7

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failed #201776
ppc64le ci-build docker-alpine
build-ppc64le

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passed #201775
s390x ci-build docker-alpine
build-s390x

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passed #201774
x86 ci-build docker-alpine
build-x86

00:11:56

passed #201773
x86_64 ci-build docker-alpine
build-x86_64

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Name Stage Failure
failed
build-ppc64le Build
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