Use a raw F string for regex in pandoc downloader (#371) #267

Job	Run time
test (ubuntu-20.04, 3.7)	44s
test (ubuntu-20.04, 3.8)	47s
test (ubuntu-20.04, 3.9)	33s
test (ubuntu-20.04, 3.10)	25s
test (ubuntu-20.04, 3.11)	25s
test (ubuntu-20.04, 3.12)	26s
test (ubuntu-20.04, pypy3.8)	1m 41s
test (ubuntu-20.04, pypy3.9)	39s
test (ubuntu-20.04, pypy3.10)	54s
test (ubuntu-22.04, 3.7)	31s
test (ubuntu-22.04, 3.8)	31s
test (ubuntu-22.04, 3.9)	29s
test (ubuntu-22.04, 3.10)	29s
test (ubuntu-22.04, 3.11)	28s
test (ubuntu-22.04, 3.12)	29s
test (ubuntu-22.04, pypy3.8)	1m 17s
test (ubuntu-22.04, pypy3.9)	40s
test (ubuntu-22.04, pypy3.10)	54s
test (macos-13, 3.7)	1m 17s
test (macos-13, 3.8)	51s
test (macos-13, 3.9)	59s
test (macos-13, 3.10)	49s
test (macos-13, 3.11)	54s
test (macos-13, 3.12)	54s
test (macos-13, pypy3.8)	1m 8s
test (macos-13, pypy3.9)	1m 12s
test (macos-13, pypy3.10)	1m 33s
test (windows-2022, 3.7)	1m 48s
test (windows-2022, 3.8)	1m 47s
test (windows-2022, 3.9)	1m 38s
test (windows-2022, 3.10)	2m 13s
test (windows-2022, 3.11)	1m 41s
test (windows-2022, 3.12)	1m 40s
test (windows-2022, pypy3.8)	2m 55s
test (windows-2022, pypy3.9)	2m 55s
test (windows-2022, pypy3.10)	2m 11s
builder_pypandoc	14s
builder_pypandoc_binary (macos-14)	47s
builder_pypandoc_binary (windows-2022)	1m 53s
builder_pypandoc_binary (ubuntu-22.04)	4m 51s
publisher_latest	16s
publisher_release	0s
	48m 48s

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