making tests sequential to avoid windows gha checks error

6 jobs for v0.1.6pub in 46 minutes and 37 seconds (queued for 1 second)
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testing Build
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Rate limit reset at: 2021-09-07 12:07:52 UTC


Execution halted
Cleaning up file based variables
ERROR: Job failed: exit code 1
failed
create_manual Build
Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> devtools::build_manual(pkg = '.', path = '/builds/WsRkjiYZ/0/miracum/dqa/dqastats/ci')
Error: Failed to build manual
Execution halted
Cleaning up file based variables
ERROR: Job failed: exit code 1