chore: Set min sdk version to 24 (Android 7). #606

Job	Run time
Docs	1m 54s
Alpine (full, Debug)	2m 12s
Debian (minimal, Debug)	2m 11s
Fedora with ASAN (full, Debug)	2m 10s
macOS user (x86_64)	2m 11s
Check for translatable strings	32s
Clang-Tidy	2m 11s
Ubuntu LTS (full, Release)	2m 11s
Update nightly release tag	3s
Flatpak	2m 0s
macOS distributable (x86_64)	2m 4s
Android (arm64-v8a, Release)	2m 1s
Windows (i686, Debug)	2m 1s
macOS distributable (arm64)	2m 5s
Windows (i686, Release)	2m 0s
Windows (x86_64, Debug)	2m 0s
Windows (x86_64, Release)	2m 2s
	31m 48s

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