Upgrade/jjwt 0.13.0

[Naenyn]

fix(deps): upgrade jjwt from 0.11.5 to 0.13.0

Migrate to the JJWT 0.12+ API:
- Use Keys.hmacShaKeyFor(Decoders.BASE64.decode(...)) for signing keys
- Replace parseClaimsJws() with parseSignedClaims()
- Replace getBody() with getPayload()
- Exclude older transitive jjwt-api from uPortal-soffit-renderer
- Declare jjwt-api explicitly on compile classpath

Note that this'll need 5.17.10 of uPortal released and the SNAPSHOT removed.