tool_msgs: make voutf() use stack instead of heap

[bagder]

For printf()ing the message to show.

[testclutch]

Analysis of PR #19651 at b64c55f9:

Test ../../tests/http/test_17_ssl_use.py::TestSSLUse::test_17_07_ssl_ciphers[TLSv1.2+3-CHACHA20SHA256-def] failed, which has NOT been flaky recently, so there could be a real issue in this PR. Note that this test has failed in 6 different CI jobs (the link just goes to one of them).

Test ../../tests/http/test_17_ssl_use.py::TestSSLUse::test_17_07_ssl_ciphers[TLSv1.2+3-CHACHA20SHA256-AES128ish] failed, which has NOT been flaky recently, so there could be a real issue in this PR. Note that this test has failed in 6 different CI jobs (the link just goes to one of them).

Test ../../tests/http/test_17_ssl_use.py::TestSSLUse::test_17_07_ssl_ciphers[TLSv1.2+3-CHACHA20SHA256-AES256ish] failed, which has NOT been flaky recently, so there could be a real issue in this PR. Note that this test has failed in 6 different CI jobs (the link just goes to one of them).

Test ../../tests/http/test_17_ssl_use.py::TestSSLUse::test_17_07_ssl_ciphers[TLSv1.2+3-CHACHA20SHA256-CHACHA20ish] failed, which has NOT been flaky recently, so there could be a real issue in this PR. Note that this test has failed in 6 different CI jobs (the link just goes to one of them).

Test ../../tests/http/test_17_ssl_use.py::TestSSLUse::test_17_07_ssl_ciphers[TLSv1.2+3-CHACHA20SHA256-AES256ish+CHACHA20ish] failed, which has NOT been flaky recently, so there could be a real issue in this PR. Note that this test has failed in 6 different CI jobs (the link just goes to one of them).

Test ../../tests/http/test_17_ssl_use.py::TestSSLUse::test_17_07_ssl_ciphers[TLSv1.2+3-AES128SHA384+CHACHA20SHA256-def] failed, which has NOT been flaky recently, so there could be a real issue in this PR. Note that this test has failed in 6 different CI jobs (the link just goes to one of them).

Test ../../tests/http/test_17_ssl_use.py::TestSSLUse::test_17_07_ssl_ciphers[TLSv1.2+3-AES128SHA384+CHACHA20SHA256-AES128ish] failed, which has NOT been flaky recently, so there could be a real issue in this PR. Note that this test has failed in 6 different CI jobs (the link just goes to one of them).

There are more failures, but that's enough from Gha.

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