Bikeshed build failing

[sbweeden]

Description

On a new Mac, did fresh install of bikshed with pip3 install bikeshed then tried to build the freshly-pulled main branch:

$ bikeshed spec
WARNING: Couldn't determine width and height of this image: images/webauthn-registration-flow-01.svg
cannot identify image file '/Users/sweeden/git/w3c/webauthn/images/webauthn-registration-flow-01.svg'
WARNING: Couldn't determine width and height of this image: images/webauthn-authentication-flow-01.svg
cannot identify image file '/Users/sweeden/git/w3c/webauthn/images/webauthn-authentication-flow-01.svg'
WARNING: Couldn't determine width and height of this image: images/fido-signature-formats-figure1.svg
cannot identify image file '/Users/sweeden/git/w3c/webauthn/images/fido-signature-formats-figure1.svg'
WARNING: Couldn't determine width and height of this image: images/fido-signature-formats-figure2.svg
cannot identify image file '/Users/sweeden/git/w3c/webauthn/images/fido-signature-formats-figure2.svg'
WARNING: Couldn't determine width and height of this image: images/string-truncation.svg
cannot identify image file '/Users/sweeden/git/w3c/webauthn/images/string-truncation.svg'
WARNING: Couldn't determine width and height of this image: images/fido-attestation-structures.svg
cannot identify image file '/Users/sweeden/git/w3c/webauthn/images/fido-attestation-structures.svg'
FATAL ERROR: Obsolete biblio ref: [rfc8152] is replaced by [rfc9053]. Either update the reference, or use [rfc8152 obsolete] if this is an intentionally-obsolete reference.
✘  Did not generate, due to fatal errors