fix(deps): pin nextcloud/ocp to dev-stable34 in psalm vendor-bin

vendor-bin/psalm/composer.json was still requiring nextcloud/ocp:dev-master,
left over from before this branch was cut. Since nextcloud/ocp's master
branch now requires PHP ~8.3+ while this file pins platform.php to 8.2.27,
the weekly automated ocp-update workflow fails every run. Point it at
dev-stable34 instead, matching the pattern already used on stable32.

Signed-off-by: Anna Larch <anna@nextcloud.com>

Author: miaulalala

vendor-bin/psalm/composer.json

@@ -1,6 +1,6 @@
 {
 	"require-dev": {
-		"nextcloud/ocp": "dev-master",
+		"nextcloud/ocp": "dev-stable34",
 		"vimeo/psalm": "^6.16.1"
 	},
 	"config": {