fix(ci): update actions to use nodejs 20

[github-actions[bot]]

Repository name	Source type	Average hole completion time (s)	Pass percentage
smol-rs/async-executor	github	0.818	0.00%
jaemk/cached	github	6.772	0.00%
tkaitchuck/constrandom	github	3.942	0.00%
tiangolo/fastapi	github	17.854	29.95%
null	null	null	null%
huggingface/huggingface_hub	github	21.226	40.00%
gcanti/io-ts	github	22.689	60.00%
lancedb/lancedb	github	106.745	0.00%
mmaitre314/picklescan	github	9.190	0.00%
simple	local	0.924	0.00%
encode/starlette	github	6.795	0.00%
colinhacks/zod	github	9.798	0.00%

Note: The "hole completion time" represents the full process of:

• copying files from the setup cache directory
• replacing the code from the file with a completion from the model
• building the project
• running the tests