K8SPSMDB-1158: Upgrade PBM to v2.6.0

CHANGE DESCRIPTION

Upgraded PBM go module to v2.6.0.

Jira

[x] Is the Jira ticket created and referenced properly?
[x] Does the Jira ticket have the proper statuses for documentation (Needs Doc) and QA (Needs QA)?
[x] Does the Jira ticket link to the proper milestone (Fix Version field)?

Tests

Config/Logging/Testability

[x] Are all needed new/changed options added to default YAML files?
[x] Did we add proper logging messages for operator actions?
[x] Did we ensure compatibility with the previous version or cluster upgrade process?
[x] Does the change support oldest and newest supported MongoDB version?
[x] Does the change support oldest and newest supported Kubernetes version?

Test name	Status
arbiter	passed
balancer	passed
custom-replset-name	passed
custom-tls	passed
cross-site-sharded	passed
data-at-rest-encryption	passed
data-sharded	passed
demand-backup	passed
demand-backup-eks-credentials	passed
demand-backup-physical	passed
demand-backup-physical-sharded	passed
demand-backup-sharded	passed
expose-sharded	passed
ignore-labels-annotations	passed
init-deploy	passed
finalizer	passed
ldap	passed
ldap-tls	passed
limits	passed
liveness	passed
mongod-major-upgrade	passed
mongod-major-upgrade-sharded	passed
monitoring-2-0	failure
multi-cluster-service	passed
non-voting	passed
one-pod	passed
operator-self-healing-chaos	passed
pitr	passed
pitr-sharded	passed
pitr-physical	passed
pvc-resize	passed
recover-no-primary	passed
replset-overrides	passed
rs-shard-migration	passed
scaling	passed
scheduled-backup	passed
security-context	passed
self-healing-chaos	passed
service-per-pod	passed
serviceless-external-nodes	passed
smart-update	passed
split-horizon	passed
storage	passed
tls-issue-cert-manager	passed
upgrade	passed
upgrade-consistency	passed
upgrade-consistency-sharded-tls	passed
upgrade-sharded	passed
users	passed
version-service	passed
We run 50 out of 50