npm audit found vulnerabilities

[DafneM]

# npm audit report

bootstrap  <=3.4.0
Severity: moderate
bootstrap Cross-site Scripting vulnerability - https://github.com/advisories/GHSA-ph58-4vrj-w6hr
XSS vulnerability that affects bootstrap - https://github.com/advisories/GHSA-3mgp-fx93-9xv5
Bootstrap Vulnerable to Cross-Site Scripting - https://github.com/advisories/GHSA-9v3m-8fp8-mj99
Bootstrap Cross-site Scripting vulnerability - https://github.com/advisories/GHSA-4p24-vmcr-4gqj
Bootstrap vulnerable to Cross-Site Scripting (XSS) - https://github.com/advisories/GHSA-3wqf-4x89-9g79
Bootstrap Cross-site Scripting vulnerability - https://github.com/advisories/GHSA-7mvr-5x2g-wfc8
fix available via `npm audit fix --force`
Will install bootstrap@3.4.1, which is outside the stated dependency range
node_modules/bootstrap

nth-check  <2.0.1
Severity: high
Inefficient Regular Expression Complexity in nth-check - https://github.com/advisories/GHSA-rp65-9cf3-cjxr
fix available via `npm audit fix --force`
Will install react-scripts@3.0.1, which is a breaking change
node_modules/svgo/node_modules/nth-check
  css-select  <=3.1.0
  Depends on vulnerable versions of nth-check
  node_modules/svgo/node_modules/css-select
    svgo  1.0.0 - 1.3.2
    Depends on vulnerable versions of css-select
    node_modules/svgo
      @svgr/plugin-svgo  <=5.5.0
      Depends on vulnerable versions of svgo
      node_modules/@svgr/plugin-svgo
        @svgr/webpack  4.0.0 - 5.5.0
        Depends on vulnerable versions of @svgr/plugin-svgo
        node_modules/@svgr/webpack
          react-scripts  >=2.1.4
          Depends on vulnerable versions of @svgr/webpack
          Depends on vulnerable versions of resolve-url-loader
          node_modules/react-scripts

postcss  <8.4.31
Severity: moderate
PostCSS line return parsing error - https://github.com/advisories/GHSA-7fh5-64p2-3v2j
fix available via `npm audit fix --force`
Will install react-scripts@3.0.1, which is a breaking change
node_modules/resolve-url-loader/node_modules/postcss
  resolve-url-loader  0.0.1-experiment-postcss || 3.0.0-alpha.1 - 4.0.0
  Depends on vulnerable versions of postcss
  node_modules/resolve-url-loader

9 vulnerabilities (3 moderate, 6 high)

To address all issues (including breaking changes), run:
  npm audit fix --force