CI: Fix golangci linter failure

[danaelhe]

In recent PRs such as #1155 , we were getting Error: golangci-lint exit with code 7 with the Lint with golangci-lint step in the CI. I was able to reproduce the issue locally:

de@ terraform-provider-digitalocean % make lint
.....
INFO File cache stats: 0 entries of total size 0B 
INFO Memory: 11 samples, avg is 40.3MB, max is 64.2MB 
INFO Execution took 975.842607ms                  
make: *** [lint] Error 7

Turns out it's a mix match of go version 1.21 and the version of golangci being used. Need to update go version to 1.22.x in the pipeline and stick golangci to versionv1.56.2in the makefile. This allowed a successful run locally:

de@ terraform-provider-digitalocean % golangci-lint run -v ./...
....
INFO [runner] linters took 5.944091265s with stages: goanalysis_metalinter: 5.938364426s 
INFO File cache stats: 0 entries of total size 0B 
INFO Memory: 69 samples, avg is 465.9MB, max is 888.3MB 
INFO Execution took 6.772305539

[andrewsomething]

👍 lgtm!!