[pkg-go] Bug#839597: update golang-github-dgrijalva-jwt-go to new upstream release

[Pirate Praveen]

package: golang-github-dgrijalva-jwt-go
version: 2.6.0-1
severity: wishlist

I would like to use this package instead of the embedded copy in
gitlab-workhorse, but it needs 3.0.0 version. Please update the package.

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