👷 Update `.gitignore` to ignore `requirements.txt` #88

Job	Run time
quality_checks_pass	1m 48s
build_and_test_22 (clang, 14, 17, libc++, Debug)	1m 33s
build_and_test_24 (clang, 16, 17, libstdc++, Debug)	1m 22s
build_and_test_22 (clang, 14, 20, libc++, Debug)	1m 57s
sanitize (undefined, clang)	2m 26s
build_and_test_24 (clang, 16, 17, libc++, Debug)	2m 12s
valgrind	2m 27s
build_and_test_22 (clang, 15, 17, libstdc++, Debug)	1m 9s
build_and_test_24 (clang, 16, 20, libstdc++, Debug)	2m 0s
sanitize (undefined, gcc)	1m 57s
build_and_test_24 (clang, 16, 20, libc++, Debug)	2m 5s
build_and_test_22 (clang, 15, 17, libc++, Debug)	1m 59s
sanitize (address, clang)	2m 13s
build_and_test_24 (clang, 17, 17, libstdc++, Debug)	1m 33s
build_and_test_22 (clang, 15, 20, libstdc++, Debug)	1m 44s
sanitize (address, gcc)	1m 53s
build_and_test_24 (clang, 17, 17, libc++, Debug)	2m 3s
build_and_test_22 (clang, 15, 20, libc++, Debug)	2m 11s
build_and_test_24 (clang, 17, 20, libstdc++, Debug)	2m 3s
sanitize (thread, clang)	2m 0s
build_and_test_24 (clang, 17, 20, libc++, Debug)	2m 20s
sanitize (thread, gcc)	2m 9s
build_and_test_24 (clang, 18, 17, libstdc++, Debug)	1m 30s
build_and_test_24 (clang, 18, 17, libc++, Debug)	3m 6s
build_and_test_24 (clang, 18, 20, libstdc++, Debug)	2m 39s
build_and_test_24 (clang, 18, 20, libc++, Debug)	2m 38s
build_and_test_24 (gcc, 12, 17, libstdc++, Debug)	1m 43s
build_and_test_24 (gcc, 12, 20, libstdc++, Debug)	1m 49s
build_and_test_24 (gcc, 13, 17, libstdc++, Debug)	1m 40s
build_and_test_24 (gcc, 13, 20, libstdc++, Debug)	2m 11s
merge_ok	3s
	1h 0m 23s

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