chore(deps): update debian docker tag to v12 #5581

Job	Run time
matrix	28s
test (c, agoo-c, c/agoo-c, default)	1m 30s
test (c, kore, c/kore, default)	1m 10s
test (cpp, drogon, cpp/drogon, default)	4m 33s
test (cpp, evhtp, cpp/evhtp, default)	5m 49s
test (elixir, cowboy, elixir/cowboy, default)	1m 57s
test (elixir, cowboy_stream, elixir/cowboy_stream, default)	2m 27s
test (elixir, phoenix_bandit, elixir/phoenix_bandit, default)	1m 49s
test (elixir, phoenix_cowboy, elixir/phoenix_cowboy, default)	2m 3s
test (elixir, plug_bandit, elixir/plug_bandit, default)	1m 41s
test (elixir, plug_cowboy, elixir/plug_cowboy, default)	2m 38s
	26m 5s

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