Data race in TestRelated and TestPermalinkExpansionSectionsRepeated on Windows

[alexandear]

The following data race occurred during the CI run on Go 1.19, Windows:

The full log

==================
WARNING: DATA RACE
Write at 0x000142582750 by goroutine 103:
  github.com/gohugoio/hugo/related.(*IndexConfig).incrNumDocs()
      D:/a/hugo/hugo/related/inverted_index.go:152 +0x484
  github.com/gohugoio/hugo/related.(*InvertedIndex).Add()
      D:/a/hugo/hugo/related/inverted_index.go:255 +0x43d
  github.com/gohugoio/hugo/resources/page.(*RelatedDocsHandler).getOrCreateIndex()
      D:/a/hugo/hugo/resources/page/pages_related.go:232 +0xa1d
  github.com/gohugoio/hugo/resources/page.Pages.withInvertedIndex()
      D:/a/hugo/hugo/resources/page/pages_related.go:136 +0xe5
  github.com/gohugoio/hugo/resources/page.Pages.search()
      D:/a/hugo/hugo/resources/page/pages_related.go:119 +0xfa
  github.com/gohugoio/hugo/resources/page.Pages.Related()
      D:/a/hugo/hugo/resources/page/pages_related.go:73 +0x384
  github.com/gohugoio/hugo/resources/page.TestRelated()
      D:/a/hugo/hugo/resources/page/pages_related_test.go:59 +0xc97
  testing.tRunner()
      C:/hostedtoolcache/windows/go/1.19.6/x64/src/testing/testing.go:1446 +0x216
  testing.(*T).Run.func1()
      C:/hostedtoolcache/windows/go/1.19.6/x64/src/testing/testing.go:1493 +0x47

Previous read at 0x000142582750 by goroutine 20:
  [failed to restore the stack]

Goroutine 103 (running) created at:
  testing.(*T).Run()
      C:/hostedtoolcache/windows/go/1.19.6/x64/src/testing/testing.go:1493 +0x75d
  testing.runTests.func1()
      C:/hostedtoolcache/windows/go/1.19.6/x64/src/testing/testing.go:1846 +0x99
  testing.tRunner()
      C:/hostedtoolcache/windows/go/1.19.6/x64/src/testing/testing.go:1446 +0x216
  testing.runTests()
      C:/hostedtoolcache/windows/go/1.19.6/x64/src/testing/testing.go:1844 +0x7ec
  testing.(*M).Run()
      C:/hostedtoolcache/windows/go/1.19.6/x64/src/testing/testing.go:1726 +0xa84
  main.main()
      _testmain.go:177 +0x2e9

Goroutine 20 (running) created at:
  testing.(*T).Run()
      C:/hostedtoolcache/windows/go/1.19.6/x64/src/testing/testing.go:1493 +0x75d
  testing.runTests.func1()
      C:/hostedtoolcache/windows/go/1.19.6/x64/src/testing/testing.go:1846 +0x99
  testing.tRunner()
      C:/hostedtoolcache/windows/go/1.19.6/x64/src/testing/testing.go:1446 +0x216
  testing.runTests()
      C:/hostedtoolcache/windows/go/1.19.6/x64/src/testing/testing.go:1844 +0x7ec
  testing.(*M).Run()
      C:/hostedtoolcache/windows/go/1.19.6/x64/src/testing/testing.go:1726 +0xa84
  main.main()
      _testmain.go:177 +0x2e9
==================
--- FAIL: TestRelated (0.01s)
    testing.go:1[319](https://github.com/gohugoio/hugo/actions/runs/4302554709/jobs/7501194890#step:17:320): race detected during execution of test
--- FAIL: TestPermalinkExpansionSectionsRepeated (0.40s)
    testing.go:1319: race detected during execution of test
FAIL
FAIL	github.com/gohugoio/hugo/resources/page	1.432s

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