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

Update module jhillyerd/enmime to v0.9.0

See merge request !12

Update module chrj/smtpd to v0.3.0

See merge request !11

Update golang.org/x/sync commit hash to 036812b

See merge request !9

Update module oschwald/geoip2-golang to v1.5.0

See merge request !8

Update module jhillyerd/enmime to v0.8.4

See merge request !7

Update module prometheus/client_golang to v1.9.0

See merge request !6

Update golang.org/x/sync commit hash to 09787c9

See merge request !5

Update module chrj/smtpd to v0.2.0

See merge request !3