tests: adjust to openssl 3

openssl3 have different output to stderr when generating keys. Adjust accordingly.

tests/abuild_keygen_test

@@ -39,7 +39,7 @@ abuild_keygen_invalid_arg_body() {
 abuild_keygen_non_interactive_body() {
 	atf_check -s exit:0 \
 		-o empty \
-		-e match:"Generating RSA.*4096" \
+		-e match:"(Generating|writing) RSA" \
 		abuild-keygen -n
 }
 
@@ -48,7 +48,7 @@ abuild_keygen_append_body() {
 		atf_check -s exit:0 \
 		\
 		-o empty \
-		-e match:"Generating RSA" \
+		-e match:"(Generating|writing) RSA" \
 		abuild-keygen --append -n
 		grep '^PACKAGER_PRIVKEY=.*user@example.com' "$HOME"/.abuild/abuild.conf \
 			|| atf_fail 'PACKAGER_PRIVKEY not set in abuild.conf'
@@ -59,7 +59,7 @@ abuild_keygen_install_without_sudo_body() {
 		atf_check -s exit:1 \
 		\
 		-o empty \
-		-e match:"Generating RSA" \
+		-e match:"(Generating|writing) RSA" \
 		abuild-keygen --install -n
 }
 
@@ -68,7 +68,7 @@ abuild_keygen_install_interactive_body() {
 		atf_check -s exit:0 \
 		\
 		-o match:"Enter file" \
-		-e match:"Generating RSA" \
+		-e match:"(Generating|writing) RSA" \
 		abuild-keygen --install
 }
 
@@ -77,7 +77,7 @@ abuild_keygen_install_non_interactive_body() {
 		atf_check -s exit:0 \
 		\
 		-o empty \
-		-e match:"Generating RSA" \
+		-e match:"(Generating|writing) RSA" \
 		abuild-keygen --install -n
 }
 
@@ -94,7 +94,7 @@ abuild_keygen_install_doas_body() {
 		atf_check -s exit:0 \
 		\
 		-o match:"fake doas" \
-		-e match:"Generating RSA" \
+		-e match:"(Generating|writing) RSA" \
 		abuild-keygen --install -n
 }