fix(auth): update shield from v1.0.0-beta.3 to v1.0.0-beta.6
v1.0.0-beta.4 fixes a security issue "Password Shucking Vulnerability" (https://github.com/codeigniter4/shield/security/advisories/GHSA-c5vj-f36q-p9vg)
v1.0.0-beta.4 fixes a security issue "Password Shucking Vulnerability" (https://github.com/codeigniter4/shield/security/advisories/GHSA-c5vj-f36q-p9vg)
mentioned in commit daa11eb9