debian-bookworm-build: add xxdThe xxd program is now required for building osmo-asf4-dfu.Related: osmo-asf4-dfu I1403d35497cdea41ea5bed2c94b9e729ca352772Change-Id: I8064c6a24ad7dfc0a6c83c1ff5bcb7b47fdd66f4
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