deploy: bump sidecar versions

[pohly]

To simplify that in the future, the hack/bump-image-versions.sh gets
added which patches all locations were we define image versions.

Unnecessary variables in pkg/apis/pmemcsi/v1beta1/deployment_types.go
get removed because they were only used there and patching the file is
simpler when there is only one variable per image.

[avalluri]

direct-testing-metrics works test panicked on 1.19:

/mnt/workspace/pmem-csi_PR-977/test/e2e/metrics/metrics.go:50
Test Panicked
/go/src/runtime/panic.go:212
Panic: runtime error: invalid memory address or nil pointer dereference
Full stack:
github.com/intel/pmem-csi/test/e2e/metrics.glob..func1.2.1()
	/mnt/workspace/pmem-csi_PR-977/test/e2e/metrics/metrics.go:81 +0x7f0
github.com/onsi/gomega.InterceptGomegaFailures(0xc0052d4ab0, 0xc0014b2660, 0x0, 0xc002627800)
	/mnt/workspace/gopath/pkg/mod/github.com/onsi/gomega@v1.10.5/gomega_dsl.go:107 +0xbb
github.com/intel/pmem-csi/test/e2e/metrics.glob..func1.2.2(0x0, 0x0)
	/mnt/workspace/pmem-csi_PR-977/test/e2e/metrics/metrics.go:107 +0x2a
reflect.Value.call(0x1af2f40, 0xc0014b2650, 0x13, 0x1de54f9, 0x4, 0xc006fbaf10, 0x0, 0x0, 0x1af2f40, 0x1, ...)
	/go/src/reflect/value.go:476 +0x8e7
reflect.Value.Call(0x1af2f40, 0xc0014b2650, 0x13, 0xc006fbaf10, 0x0, 0x0, 0xc8e04bec866, 0xc0000606d8, 0xc00005e000)
	/go/src/reflect/value.go:337 +0xb9

[pohly]

direct-testing-metrics works test panicked on 1.19:

I've reopened issue #972 for this.

[pohly]

csi-provisioner:v2.2.1 no longer supports the storage capacity alpha API, i.e. this update here cannot work.

I'll close this PR and do the sidecar update together with introducing a deployment for 1.21 where storage capacity tracking then is enabled by default.