feat: update React app version to 7.0 in development environment

Author: valearna

src/frontend/submission_form/.env.development

@@ -2,4 +2,4 @@ REACT_APP_API_DB_WRITE_ENDPOINT=https://acknowledge-dev.textpressolab.com/api/wr
 REACT_APP_API_DB_READ_ENDPOINT=https://acknowledge-dev.textpressolab.com/api/read
 REACT_APP_API_READ_ENDPOINT=https://acknowledge-dev.textpressolab.com/api/read_paper_info
 REACT_APP_API_AUTOCOMPLETE_ENDPOINT=https://acknowledge-dev.textpressolab.com/api/read_autocomplete
-REACT_APP_VERSION=6.0 (dev)
+REACT_APP_VERSION=7.0 (dev)