chore(deps): upgrade go-git to 5.19.2 for v1.20

[ranakan19]

What type of PR is this?
fixes https://redhat.atlassian.net/browse/GITOPS-11249
manual cherry pick of #1251 for v1.20

/kind bug

What does this PR do / why we need it:
fixes https://www.cve.org/CVERecord?id=CVE-2026-71556

Have you updated the necessary documentation?

• Documentation update is required by this PR.
• Documentation has been updated.

Which issue(s) this PR fixes:

Fixes #?

Test acceptance criteria:

• Unit Test
• E2E Test

How to test changes / Special notes to the reviewer:

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[olivergondza]

/lgtm
/approve

[ranakan19]

to resolve:

golangci-lint run --new-from-rev=master      
controllers/argocd/argocd.go:249:4: SA1019: (github.com/argoproj-labs/argocd-operator/api/v1beta1.ArgoCDSpec).Grafana is deprecated: Grafana defines the Grafana server options for ArgoCD. (staticcheck)
                        Grafana:            getArgoGrafanaSpec(),

[ranakan19]

to resolve:

test/openshift/e2e/ginkgo/parallel/1-121_validate_image_updater_test.go:172:6: SA1019: (github.com/argoproj-labs/argocd-image-updater/api/v1alpha1.ImageUpdaterSpec).Namespace is deprecated: This field is deprecated and will be removed in a future release. The controller now uses the ImageUpdater CR's namespace (metadata.namespace) to determine which namespace to search for applications. This field is ignored. +optional (staticcheck)      
                                        Namespace: &namespace,

[olivergondza]

Thanks, Kanika.

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: olivergondza
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[ranakan19]

/retest

failed due to connect: network is unreachable

[ranakan19]

/retest

[openshift-ci]

@ranakan19: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/v4.21-kuttl-sequential	092a412	link	true	/test v4.21-kuttl-sequential
ci/prow/v4.21-e2e	092a412	link	true	/test v4.21-e2e

Full PR test history. Your PR dashboard.

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