skymarshal: Fix build for eigen >= 3.4 #387

Job	Run time
test-on-ubuntu (ubuntu-20.04, python3.8, gcc-11, g++-11, g++-11, "ppa:ubuntu-toolchain-r/test")	30m 47s
test-on-ubuntu (ubuntu-20.04, python3.9, gcc-11, g++-11, g++-11, "ppa:ubuntu-toolchain-r/test")	31m 21s
test-on-ubuntu (ubuntu-20.04, python3.10, gcc-11, g++-11, g++-11, "ppa:ubuntu-toolchain-r/test")	28m 48s
test-on-ubuntu (ubuntu-20.04, python3.11, gcc-11, g++-11, g++-11, "ppa:ubuntu-toolchain-r/test")	30m 21s
test-on-ubuntu (ubuntu-20.04, python3.12, gcc-11, g++-11, g++-11, "ppa:ubuntu-toolchain-r/test")	30m 3s
test-on-ubuntu (ubuntu-22.04, python3.8, gcc-11, g++-11, g++-11, "ppa:ubuntu-toolchain-r/test")	28m 57s
test-on-ubuntu (ubuntu-22.04, python3.9, gcc-11, g++-11, g++-11, "ppa:ubuntu-toolchain-r/test")	30m 34s
test-on-ubuntu (ubuntu-22.04, python3.10, gcc-11, g++-11, g++-11, "ppa:ubuntu-toolchain-r/test")	28m 36s
test-on-ubuntu (ubuntu-22.04, python3.11, gcc-11, g++-11, g++-11, "ppa:ubuntu-toolchain-r/test")	28m 46s
test-on-ubuntu (ubuntu-22.04, python3.12, gcc-11, g++-11, g++-11, "ppa:ubuntu-toolchain-r/test")	27m 29s
test-on-ubuntu (ubuntu-20.04, python3.8, gcc-5, g++-5, g++-5, "deb http://us.archive.ubuntu.com/u...	26m 35s
test-on-ubuntu (ubuntu-20.04, python3.8, clang-7, clang++-7, clang-7)	29m 58s
test-on-ubuntu (ubuntu-22.04, python3.10, clang-15, clang++-15, clang-15)	33m 46s
	6h 26m 1s

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