Upgrade velero docker image to use go 1.18

[Lyndon-Li]

Upgrade velero docker image to use go 1.18 and upgrade golangci-lint to 1.45.0

[codecov-commenter]

Codecov Report

Merging #5459 (162680b) into main (6b2cb7a) will increase coverage by 0.04%.
The diff coverage is 27.90%.

@@            Coverage Diff             @@
##             main    #5459      +/-   ##
==========================================
+ Coverage   40.52%   40.56%   +0.04%     
==========================================
  Files         236      236              
  Lines       20482    20484       +2     
==========================================
+ Hits         8300     8310      +10     
+ Misses      11572    11565       -7     
+ Partials      610      609       -1     

Impacted Files	Coverage Δ
pkg/archive/extractor.go	0.00% <0.00%> (ø)
pkg/cmd/cli/backup/describe.go	0.00% <0.00%> (ø)
pkg/cmd/cli/backuplocation/create.go	31.42% <0.00%> (ø)
pkg/cmd/cli/backuplocation/delete.go	0.00% <0.00%> (ø)
pkg/cmd/cli/backuplocation/set.go	0.00% <0.00%> (ø)
pkg/cmd/cli/nodeagent/server.go	12.50% <0.00%> (ø)
pkg/cmd/server/server.go	6.58% <0.00%> (ø)
pkg/cmd/util/output/backup_describer.go	0.00% <0.00%> (ø)
pkg/cmd/util/output/output.go	0.00% <ø> (ø)
pkg/cmd/util/output/restore_describer.go	0.00% <0.00%> (ø)
... and 17 more

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[Lyndon-Li]

The old version of golangci-lint doesn't work with go 1.18, so need to upgrade it as well.