refactor: no unset of for-loop variables

Signed-off-by: Lucas Larson <LucasLarson@riseup.net>

Author: LucasLarson

update

@@ -1,5 +1,5 @@
 #!/usr/bin/env sh
-update='2025-07-03'
+update='2025-07-04'
 command -p -- printf -- '\n\n                 .___       __\n __ ________   __\174 _\057____ _\057  \174_  ____\n\174  \174  \134____ \134 \057 __ \174\134__  \134\134   __\134\057 __ \134\n\174  \174  \057  \174_\076 \076 \057_\057 \174 \057 __ \134\174  \174 \134  ___\057\n\174____\057\174   __\057\134____ \174\050____  \057__\174  \134___  \076\n      \174__\174        \134\057     \134\057          \134\057\n a Lucas Larson production\n\n' >&2 && command -p -- sleep 1
 command -p -- printf -- '\360\237\223\241  verifying network connectivity' >&2
 command -p -- sleep 1
@@ -105,7 +105,6 @@ if command -v -- python3 >/dev/null 2>&1; then
   if command python3 -m pip >/dev/null 2>&1; then
     command -p -- printf -- '\n\360\237\220\215  updating outdated Python packages...\n' >&2
     command python3 -m pip list --format=columns --outdated | command -p -- sed -n -e '3,$ s/^\([^[:space:]]*\).*/\1/p' | while IFS='' read -r -- package; do command python3 -m pip install --upgrade --verbose --verbose -- "${package-}"; done
-    unset package >/dev/null 2>&1 || package=''
   fi
   command -p -- printf -- 'checking for pyenv installation...\n' >&2
   if command -v -- pyenv >/dev/null 2>&1; then