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build: bump clang version to 19

The patch bumps the Clang version from 16 to 19 in workflows that
are intended to use the most modern Clang version. Many things
were changed since version 16, see release notes in [1], [2], [3].

The `-Ofast` command-line option has been deprecated in Clang 19,
see [3]. It is advised to switch to `-O3 -ffast-math` if the use
of non-standard math behavior is intended, and -O3 otherwise.
The patch replaces `-Ofast` with `-O3 -ffast-math` to suppress
a message below in a build log:

NO_WRAP
clang-19: warning: argument '-Ofast' is deprecated; use '-O3 -ffast-math' for
	  the same behavior, or '-O3' to enable only conforming optimizations [-Wdeprecated-ofast]
NO_WRAP

The bump had needed an update of Dockerfile used for building
the Docker image used in the aforementioned workflows, see pull
request in [4].

1. https://releases.llvm.org/17.0.1/tools/clang/docs/ReleaseNotes.html
2. https://releases.llvm.org/18.1.6/tools/clang/docs/ReleaseNotes.html
3. https://releases.llvm.org/19.1.0/tools/clang/docs/ReleaseNotes.html
4. https://github.com/tarantool/infra/pull/206

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