Thanks.
I thought you were keeping RMD160, and replacing SHA1 with blake2s?
Looks like you need to bump DIGEST_REQD too - from a freshly updated pkgsrc:
[2021/10/26 Tue 11:02:09] agc@netbsd-002 ...pkgsrc/misc/libutf [9835] > make
=> Bootstrap dependency digest>=20010302: found digest-20190127
WARNING: [
license.mk] Every package should define a LICENSE.
No such algorithm `BLAKE2s'
checksum: Checksum BLAKE2s mismatch for libutf-3.0.tar.gz
ERROR: Make sure the Makefile and checksum file (/usr/pkgsrc/misc/libutf/distinfo)
ERROR: are up to date. If you want to override this check, type
ERROR: "/usr/bin/make NO_CHECKSUM=yes [other args]".
*** Error code 1
Stop.
make: stopped in /usr/pkgsrc/misc/libutf
[2021/10/26 Tue 11:02:14] agc@netbsd-002 ...pkgsrc/misc/libutf [9836] > digest -V
20190127
[2021/10/26 Tue 11:02:27] agc@netbsd-002 ...pkgsrc/misc/libutf [9837] > grep -r 'DIGEST.*REQD' ../../mk
../../mk/tools/digest.mk:# DIGEST_REQD is the minimum version of digest required.
../../mk/tools/digest.mk:DIGEST_REQD?= 20010302
../../mk/tools/
digest.mk: if ${PKG_ADMIN} pmatch "digest>="${DIGEST_REQD:Q} \
../../mk/tools/digest.mk:TOOLS_DEPENDS.digest?= digest>=${DIGEST_REQD}:../../pkgtools/digest
[2021/10/26 Tue 11:04:14] agc@netbsd-002 ...pkgsrc/misc/libutf [9838] >