chore: update coverage badge

[amagyar-iohk]

Description:

Updates coverage badge in README.md file

Checklist:

• My PR follows the contribution guidelines of this project
• My PR is free of third-party dependencies that don't comply with the Allowlist
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked the PR title to follow the conventional commit specification

[github-actions]

# npm audit report

cross-spawn  <7.0.5
Severity: high
Regular Expression Denial of Service (ReDoS) in cross-spawn - https://github.com/advisories/GHSA-3xgq-45jj-v275
fix available via `npm audit fix`
node_modules/cross-spawn

elliptic  <6.6.0
Valid ECDSA signatures erroneously rejected in Elliptic - https://github.com/advisories/GHSA-fc9h-whq2-v747
No fix available
node_modules/elliptic
  @hyperledger/identus-apollo  *
  Depends on vulnerable versions of elliptic
  node_modules/@hyperledger/identus-apollo

3 vulnerabilities (2 low, 1 high)

To address issues that do not require attention, run:
  npm audit fix

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

[github-actions]

# npm audit report

cross-spawn  7.0.0 - 7.0.4
Severity: high
Regular Expression Denial of Service (ReDoS) in cross-spawn - https://github.com/advisories/GHSA-3xgq-45jj-v275
fix available via `npm audit fix`
node_modules/cross-spawn

elliptic  <6.6.0
Valid ECDSA signatures erroneously rejected in Elliptic - https://github.com/advisories/GHSA-fc9h-whq2-v747
No fix available
node_modules/elliptic
  @hyperledger/identus-apollo  *
  Depends on vulnerable versions of elliptic
  node_modules/@hyperledger/identus-apollo

3 vulnerabilities (2 low, 1 high)

To address issues that do not require attention, run:
  npm audit fix

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

[github-actions]

Lines	Statements	Branches	Functions
	76.12% (3648/4792)	66.53% (1676/2519)	80.35% (867/1079)