Update to go-pkgz/auth/v2 and golang-jwt/jwt/v5

[paskal]

This will also serve as a reference for go-pkgz/auth/v2 migration, and I'll add links to this PR to the readme for the auth package.

[coveralls]

Pull Request Test Coverage Report for Build 8638476796

Details

• 20 of 33 (60.61%) changed or added relevant lines in 3 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.02%) to 84.824%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
backend/app/rest/api/admin.go	6	9	66.67%
backend/app/cmd/server.go	6	16	37.5%

Files with Coverage Reduction	New Missed Lines	%
backend/app/cmd/server.go	1	83.53%

Totals
Change from base Build 8388042292:	-0.02%
Covered Lines:	5975
Relevant Lines:	7044

---

💛 - Coveralls

[github-actions]

Pull Request Test Coverage Report for Build 10192720403

Details

• 20 of 33 (60.61%) changed or added relevant lines in 3 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.02%) to 84.832%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
backend/app/rest/api/admin.go	6	9	66.67%
backend/app/cmd/server.go	6	16	37.5%

Files with Coverage Reduction	New Missed Lines	%
backend/app/cmd/server.go	1	83.53%

Totals
Change from base Build 10172404701:	-0.02%
Covered Lines:	5990
Relevant Lines:	7061

---

💛 - Coveralls