Update module golang.org/x/sync to v0.5.0

See merge request !32

Update module golang.org/x/sync to v0.4.0

See merge request !31

Update module github.com/jhillyerd/enmime to v1.0.1

See merge request !30

Update module github.com/oschwald/geoip2-golang to v1.9.0

See merge request !28

Update module golang.org/x/sync to v0.3.0

See merge request !27

Update module github.com/jhillyerd/enmime to v1

See merge request !29

Update module github.com/jhillyerd/enmime to v0.11.0

See merge request !25

Update module github.com/jhillyerd/enmime to v0.10.1

See merge request !22

Update module github.com/oschwald/geoip2-golang to v1.8.0

See merge request !17

Update module golang.org/x/sync to v0.1.0

See merge request !24

Update golang.org/x/sync digest to f12130a

See merge request !21

Update golang.org/x/sync digest to 886fb93

See merge request !19

Update module github.com/jhillyerd/enmime to v0.10.0

See merge request !18

Update module github.com/chrj/smtpd to v0.3.1

See merge request !15

Update module github.com/jhillyerd/enmime to v0.9.2

See merge request !14

Update module github.com/prometheus/client_golang to v1.11.0

See merge request !13

These are useful to spot failures.

Also, run tests before building the container image.

Update module prometheus/client_golang to v1.10.0

See merge request !10