update vue loader package

[Niveshkrishna]

vue loader version needs to be bumped to at least v16.0.0 as per this report GHSA-76p3-8jx3-jpfq

# npm audit report

loader-utils  <2.0.3
Severity: critical
Prototype pollution in webpack loader-utils - https://github.com/advisories/GHSA-76p3-8jx3-jpfq
No fix available
node_modules/vue-loader/node_modules/loader-utils
node_modules/vue-style-loader/node_modules/loader-utils
  vue-loader  2.0.0 - 16.0.0-rc.2
  Depends on vulnerable versions of loader-utils
  Depends on vulnerable versions of vue-style-loader
  node_modules/vue-loader
    @nextcloud/webpack-vue-config  *
    Depends on vulnerable versions of vue-loader
    node_modules/@nextcloud/webpack-vue-config
  vue-style-loader  *
  Depends on vulnerable versions of loader-utils
  node_modules/vue-style-loader

4 critical severity vulnerabilities

Some issues need review, and may require choosing
a different dependency.

[skjnldsv]

webpack/loader-utils#220

[skjnldsv]

10:31 [admin@workstation] ~/git/webpack-vue-config% npm audit                                                                                      git:(master)
found 0 vulnerabilities

10:31 [admin@workstation] ~/git/webpack-vue-config% npm ls vue-loader                                                                              git:(master)
@nextcloud/webpack-vue-config@5.4.0 /home/admin/git/webpack-vue-config
└── vue-loader@15.10.0

10:31 [admin@workstation] ~/git/webpack-vue-config% npm ls loader-utils                                                                            git:(master)
@nextcloud/webpack-vue-config@5.4.0 /home/admin/git/webpack-vue-config
└─┬ vue-loader@15.10.0
  ├── loader-utils@1.4.2
  └─┬ vue-style-loader@4.1.3
    └── loader-utils@1.4.2 deduped