The reason is likely that an old version of CxxWrap is used, as the new version fixed the compatibility:
(SDPA) pkg> st --outdated -m
⌅ [1f15a43c] CxxWrap v0.16.2 (<v0.17.3): SDPA
⌅ [7fc90fd6] SDPA_jll v700.300.1800+0 (<v700.301.800+0): SDPA, julia
⌅ [3eaa8342] libcxxwrap_julia_jll v0.13.4+0 (<v0.14.4+0): CxxWrap, SDPA_jll