pin packer version to 1.9.5

[kranurag7]

if packer version is greater than 1.9.5 in semver terms then downgrade packer.

Fixes #1379

with centos container

docker run --rm -it centos:latest sh
# put hack/utils.sh & hack/ensure-packer.sh and +x permissions. 
sh-4.4# ./packer.sh 
Packer is already installed, checking version...
unexpected packer found

with 1.10.0 version of packer

$ ./hack/ensure-packer.sh
Packer is already installed, checking version...
unsupported packer version (1.10.0) found
current packer version: 1.10.0 is not supported
Downgrading packer to 1.9.5
Installing packer v1.9.5 in .local/bin
packer_1.9.5_linux_amd64.zip: OK
Archive:  packer_1.9.5_linux_amd64.zip
  inflating: packer

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #

Additional context
Add any other context for the reviewers

[k8s-ci-robot]

Hi @kranurag7. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[mboersma]

/ok-to-test

[mboersma]

I'm seeing this in the logs:

hack/ensure-packer.sh
Packer is already installed, checking version...
make: *** [Makefile:61: deps-common] Error 141

[kranurag7]

I'm seeing this in the logs:

hack/ensure-packer.sh
Packer is already installed, checking version...
make: *** [Makefile:61: deps-common] Error 141

Hey. sorry for being late here and because of that the patch was open for a while now. :(
w.r.t. this, I changed the following and I think this should be good now. (thanks to set -x 🙃)

-   existing_packer_version=$(packer version | head -1 | cut -d 'v' -f 2)
+   existing_packer_version=$(packer version | head -1 | cut -d 'v' -f 2; exit 0)

[mboersma]

lgtm

@kranurag7 could you squash the commits into one and force-push?

[mboersma]

/lgtm

[mboersma]

/assign @AverageMarcus @drew-viles

[drew-viles]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: drew-viles

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[drew-viles]

/hold

Actually @kranurag7 can you resquash the commits again please?

[AverageMarcus]

/lgtm

I'll leave it to @drew-viles to unhold :)

[drew-viles]

/unhold

[drew-viles]

Sorted. Thanks for this and your patience with us! @kranurag7