fix: use HTTPS for cpanminus download in CI

Switch curl from http:// to https:// when downloading cpanminus to
prevent MITM attacks. Also add -fsSL flags for fail-fast on HTTP
errors and silent progress.

Fixes #2049

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Signed-off-by: Zack Koppert <zkoppert@github.com>

Author: zkoppert

.github/workflows/ci.yml

@@ -48,7 +48,7 @@ jobs:
           sudo apt-get update -qq
           sudo apt-get install perl rakudo-pkg
 
-          curl -L http://cpanmin.us | perl - --sudo App::cpanminus
+          curl -fsSL https://cpanmin.us | perl - --sudo App::cpanminus
           sudo cpanm --installdeps --notest Pod::Simple
 
       - name: Install Python dependencies