fix(ci): Exclude -latest tox envs from CI runs

runtox.sh uses grep to match tox environments, so a search like
"py3.14-httpx" would match both the versioned env and the -latest
alias, running tests twice. Filter out -latest envs unless explicitly
requested.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: sentrivana

scripts/runtox.sh

@@ -15,7 +15,12 @@ fi
 
 searchstring="$1"
 
-ENV="$($TOXPATH -l | grep -- "$searchstring" | tr $'\n' ',')"
+# Filter out -latest environments unless explicitly requested
+if [[ "$searchstring" == *-latest* ]]; then
+    ENV="$($TOXPATH -l | grep -- "$searchstring" | tr $'\n' ',')"
+else
+    ENV="$($TOXPATH -l | grep -- "$searchstring" | grep -v -- '-latest$' | tr $'\n' ',')"
+fi
 
 if [ -z "${ENV}" ]; then
     echo "No targets found. Skipping."