Update cheatsheets

linux/dropbearconvert

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# dropbearconvert
+
+> Convert between Dropbear and OpenSSH private key formats.
+> More information: <https://manned.org/dropbearconvert.1>.
+
+- Convert an OpenSSH private key to the Dropbear format:
+
+`dropbearconvert openssh dropbear {{path/to/input_key}} {{path/to/output_key}}`
+
+- Convert a Dropbear private key to the OpenSSH format:
+
+`dropbearconvert dropbear openssh {{path/to/input_key}} {{path/to/output_key}}`