Remove -aes256 as it's ignored on exporting

The following warning will appear:
Warning: output encryption option -aes256 ignored with -export

testing/web3signer_tests/tls/generate.sh

@@ -12,9 +12,9 @@
 # See https://github.com/sigp/lighthouse/issues/6442#issuecomment-2474979183
 
 openssl req -x509 -sha256 -nodes -days 825 -newkey rsa:4096 -keyout web3signer/key.key -out web3signer/cert.pem -config web3signer/config &&
-openssl pkcs12 -export -aes256 -out web3signer/key.p12 -inkey web3signer/key.key -in web3signer/cert.pem -password pass:$(cat web3signer/password.txt) &&
+openssl pkcs12 -export -out web3signer/key.p12 -inkey web3signer/key.key -in web3signer/cert.pem -password pass:$(cat web3signer/password.txt) &&
 cp web3signer/cert.pem lighthouse/web3signer.pem &&
 openssl req -x509 -sha256 -nodes -days 825 -newkey rsa:4096 -keyout lighthouse/key.key -out lighthouse/cert.pem -config lighthouse/config &&
-openssl pkcs12 -export -aes256 -out lighthouse/key.p12 -inkey lighthouse/key.key -in lighthouse/cert.pem -password pass:$(cat lighthouse/password.txt) &&
-openssl pkcs12 -export -legacy -aes256 -out lighthouse/key_legacy.p12 -inkey lighthouse/key.key -in lighthouse/cert.pem -password pass:$(cat lighthouse/password.txt) &&
+openssl pkcs12 -export -out lighthouse/key.p12 -inkey lighthouse/key.key -in lighthouse/cert.pem -password pass:$(cat lighthouse/password.txt) &&
+openssl pkcs12 -export -legacy -out lighthouse/key_legacy.p12 -inkey lighthouse/key.key -in lighthouse/cert.pem -password pass:$(cat lighthouse/password.txt) &&
 openssl x509 -noout -fingerprint -sha256 -inform pem -in lighthouse/cert.pem | cut -b 20-| sed "s/^/lighthouse /" > web3signer/known_clients.txt