🔖 Bump `libpna` version to `0.6.2` #2029

Job	Run time
rust_doc_test (ubuntu-latest, stable)	56s
rust_doc_test (ubuntu-latest, beta)	1m 2s
rust_doc_test (ubuntu-latest, nightly)	58s
rust_doc_test (windows-latest, stable)	2m 9s
rust_doc_test (windows-latest, beta)	1m 55s
rust_doc_test (windows-latest, nightly)	1m 46s
rust_doc_test (macos-latest, stable)	1m 34s
rust_doc_test (macos-latest, beta)	3m 3s
rust_doc_test (macos-latest, nightly)	3m 5s
rust_doc_test (freebsd-latest, stable)	3m 24s
rust_doc_test (freebsd-latest, beta)	3m 40s
rust_doc_test (freebsd-latest, nightly)	4m 1s
	27m 33s

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