commit-graph: increment progress indicator #1734

Job	Run time
config	5s
fuzz smoke test	33s
win+VS build	0s
linux-musl (alpine)	1m 50s
linux32 (daald/ubuntu32:xenial)	1m 48s
pedantic (fedora)	1m 39s
documentation	2m 0s
linux-asan-ubsan (ubuntu-latest)	2m 3s
linux-gcc (ubuntu-20.04)	2m 2s
linux-gcc-default (ubuntu-latest)	2m 1s
linux-leaks (ubuntu-latest)	1m 58s
linux-reftable (ubuntu-latest)	1m 59s
linux-reftable-leaks (ubuntu-latest)	2m 0s
linux-sha256 (ubuntu-latest)	1m 59s
linux-TEST-vars (ubuntu-20.04)	2m 0s
osx-clang (macos-13)	2m 4s
osx-gcc (macos-13)	2m 4s
sparse	1m 58s
static-analysis	1m 57s
osx-reftable (macos-13)	2m 17s
win build	1m 43s
win+VS test	0s
win test	0s
	36m 0s

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