fix: fixed 15 digits msin + plmn

Merge pull request #7 from free-ran-ue/dependabot/go_modules/github.c…

…om/free-ran-ue/free-ran-ue/v2-2.3.11

chore(deps): bump github.com/free-ran-ue/free-ran-ue/v2 from 2.3.10 to 2.3.11

Merge pull request #6 from free-ran-ue/dependabot/go_modules/github.c…

…om/free-ran-ue/free-ran-ue/v2-2.3.10

chore(deps): bump github.com/free-ran-ue/free-ran-ue/v2 from 2.3.8 to 2.3.10

feat: frush util