[v24.2.x] gha: fix pip install on python actions

[vbotbuildovich]

Backport #23715 to branch v24.2.x. Note that this issue was created as a placeholder, since the original PR's commit(s) could not be automatically cherry-picked.
Here are the commands to execute:

git checkout v24.2.x
git checkout -b vbotbuildovich/backport-23715-v24.2.x-506
git cherry-pick -x d2ec222f29

git push origin vbotbuildovich/backport-23715-v24.2.x-506
gh pr create \
  --title "[v24.2.x] gha: fix pip install on python actions" \
  --base "v24.2.x" \
  --label "kind/backport" \
  --head "vbotbuildovich/backport-23715-v24.2.x-506" \
  --draft \
  --repo "redpanda-data/redpanda" \
  --milestone "v24.2.x-next" \
  --body "Backport of PR https://github.com/redpanda-data/redpanda/pull/23715 "