frequencies: Initialize variables in proper scope #2143

Job	Run time
test (python=3.8 biopython=1.80)	7m 53s
test (python=3.8 biopython=latest)	7m 35s
pathogen-repo-ci (avian-flu)	40s
test (python=3.9 biopython=1.80)	7m 47s
pathogen-repo-ci (ebola)	58s
pathogen-repo-ci (lassa)	44s
test (python=3.9 biopython=latest)	7m 53s
pathogen-repo-ci (mumps)	1m 1s
test (python=3.10 biopython=1.80)	8m 18s
pathogen-repo-ci (ncov)	1m 2s
test (python=3.10 biopython=latest)	7m 42s
pathogen-repo-ci (rsv)	2m 18s
test (python=3.11 biopython=1.80)	7m 58s
pathogen-repo-ci (seasonal-flu)	1m 2s
build-docs / build-conda	0s
pathogen-repo-ci (tb)	1m 15s
test (python=3.11 biopython=latest)	7m 56s
build-docs / build-pip	58s
codecov	11s
	1h 13m 11s

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