Merge pull request #136 from nextstrain/snakemake-7.24.1

chore(deps): update Snakemake to 7.24.1
discussed in #135
and https://bedfordlab.slack.com/archives/C01LCTT7JNN/p1680796713552249

Dockerfile

@@ -184,10 +184,11 @@ RUN pip3 install envdir==1.0.1
 RUN pip3 install awscli==1.18.195
 
 # Install Snakemake and related optional dependencies.
-RUN pip3 install snakemake==5.10.0
+# Pinned to 7.24.1 for stability (2023-03-13)
+RUN pip3 install snakemake==7.24.1
 # Google Cloud Storage package is required for Snakemake to fetch remote files
 # from Google Storage URIs.
-RUN pip3 install google-cloud-storage==2.1.0
+RUN pip3 install google-cloud-storage==2.7.0
 
 # Install epiweeks (for ncov)
 RUN pip3 install epiweeks==2.1.2