Use a supported Python for workflow tests

scripts/python

@@ -0,0 +1,11 @@
+#!/bin/sh
+set -eu
+
+for python in python3.13 python3.12 python3.11; do
+    if command -v "$python" >/dev/null 2>&1; then
+        exec "$python" "$@"
+    fi
+done
+
+echo "photoanalyzer: Python 3.11 or newer is required" >&2
+exit 2

scripts/work-item

@@ -1,11 +1,5 @@
 #!/bin/sh
 set -eu
 
-for python in python3.13 python3.12 python3.11; do
-    if command -v "$python" >/dev/null 2>&1; then
-        exec "$python" -m work_item "$@"
-    fi
-done
-
-echo "work-item: Python 3.11 or newer is required" >&2
-exit 2
+SCRIPT_DIR=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
+exec "$SCRIPT_DIR/python" -m work_item "$@"