CC-1438: Update bun buildpack #868

Job	Run time
test_course_definition / docker_lint	5s
test_course_definition / identify_language_slugs	5s
test_course_definition / js_lint	18s
test_course_definition / go_lint	3s
test_course_definition / lint	1m 8s
test_course_definition / markdown_lint	13s
test_course_definition / rust_lint	8s
test_course_definition / validate-schemas	17s
test_course_definition / verify_templates_compiled	23s
test_course_definition / validate-stages-naming	5s
test_course_definition / test (c)	30s
test_course_definition / test (clojure)	45s
test_course_definition / test (cpp)	44s
test_course_definition / test (crystal)	44s
test_course_definition / test (csharp)	44s
test_course_definition / test (elixir)	40s
test_course_definition / test (gleam)	43s
test_course_definition / test (go)	43s
test_course_definition / test (haskell)	44s
test_course_definition / test (java)	42s
test_course_definition / test (javascript)	31s
test_course_definition / test (kotlin)	43s
test_course_definition / test (ocaml)	41s
test_course_definition / test (php)	32s
test_course_definition / test (python)	26s
test_course_definition / test (ruby)	42s
test_course_definition / test (rust)	41s
test_course_definition / test (scala)	42s
test_course_definition / test (swift)	42s
test_course_definition / test (typescript)	21s
test_course_definition / test (zig)	43s
	16m 28s

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