fix codecov server sync

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https://github.com/ropensci/DataPackageR/actions/runs/8717854538/job/23913882639

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$detail
[1] "Unable to locate build via Github Actions API. Please upload with the Codecov repository upload token to resolve issue."

Also, only on the codecov runner:

> library(testthat)
> library(DataPackageR)
> # Test only if pandoc is available.
> if (rmarkdown::pandoc_available()) {
+   test_check("DataPackageR")
+ }
[ FAIL 0 | WARN 1 | SKIP 0 | PASS 228 ]

══ Warnings ════════════════════════════════════════════════════════════════════
── Warning ('test-updating-datapackager-version.R:23:3'): can update ───────────
cannot remove file '/tmp/RtmpwBIUt5/subsetCars/news.md', reason 'No such file or directory'
Backtrace:
    ▆
 1. └─base::file.remove(file.path(tempdir(), "subsetCars", "news.md")) at test-updating-datapackager-version.R:23:3

[ FAIL 0 | WARN 1 | SKIP 0 | PASS 228 ]
> 

codecov/codecov-action#557

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r-lib/actions#834

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In discussion with rOpenSci personnel on how to get the Codecov secret.