Update code_execution.sh

Author: logankilpatrick

samples/rest/code_execution.sh

@@ -2,7 +2,7 @@ set -eu
 
 echo "[START code_execution_basic]"
 # [START code_execution_basic]
-curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-flash:generateContent?key=$GOOGLE_API_KEY" \
+curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash:generateContent?key=$GEMINI_API_KEY" \
 -H 'Content-Type: application/json' \
 -d ' {"tools": [{"code_execution": {}}],
     "contents": {
@@ -16,7 +16,7 @@ curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-flash:g
 
 echo "[START code_execution_chat]"
 # [START code_execution_chat]
-curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-flash:generateContent?key=$GOOGLE_API_KEY" \
+curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash:generateContent?key=$GEMINI_API_KEY" \
 -H 'Content-Type: application/json' \
 -d '{"tools": [{"code_execution": {}}],
     "contents": [