lfs_pointer: check LFS pointer `oid` lines more strictly

Fixes: #48
21 jobs for lfs-oid-line-validation in 6 minutes and 44 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Prepare
passed #4680919
linux rust docker ghostflow
prepare:cargo-cache-mindeps

00:00:43

passed #4680918
linux rust docker ghostflow
prepare:cargo-cache-newest

00:00:47

passed #4680920
linux rust docker ghostflow
prepare:git

00:04:02

 
  Build
passed #4680921
linux rust docker ghostflow
build:cargo-clippy

00:00:53

passed #4680922
linux rust docker ghostflow
build:cargo-clippy-features

00:00:47

passed #4680926
linux rust docker ghostflow
build:cargo-mindeps

00:01:30

passed #4680929
linux rust docker ghostflow
build:cargo-mindeps-features

00:01:46

passed #4680923
linux rust docker ghostflow
build:cargo-minimum

00:01:38

passed #4680927
linux rust docker ghostflow
build:cargo-minimum-features

00:01:56

passed #4680925
linux rust docker ghostflow
build:cargo-nightly

00:01:32

passed #4680924
linux rust docker ghostflow
build:cargo-stable

00:01:33

passed #4680928
linux rust docker ghostflow
build:cargo-stable-features

00:01:58

 
  Test
passed #4680933
linux rust docker ghostflow
test:cargo-mindeps

00:00:37

passed #4680936
linux rust docker ghostflow
test:cargo-mindeps-features

00:00:37

passed #4680930
linux rust docker ghostflow
test:cargo-minimum

00:00:50

passed #4680934
linux rust docker ghostflow
test:cargo-minimum-features

00:00:39

passed #4680932
linux rust docker ghostflow
test:cargo-nightly

00:00:38

passed #4680931
linux rust docker ghostflow
test:cargo-stable

00:00:44

passed #4680935
linux rust docker ghostflow
test:cargo-stable-features

00:00:39

passed #4680937
linux rust docker ghostflow
test:git-master

00:00:43

 
  External
failed ghostflow-check-master