[Backport 2.x] Updates demo certs for integ tests

[owaiskazi19]

Description

Backport of #1018

Issues Resolved

List any issues this PR will resolve, e.g. Closes [...].

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[codecov]

Codecov Report

Merging #1020 (adb9093) into 2.x (4b21068) will increase coverage by 0.04%.
Report is 8 commits behind head on 2.x.
The diff coverage is 92.30%.

@@             Coverage Diff              @@
##                2.x    #1020      +/-   ##
============================================
+ Coverage     79.42%   79.46%   +0.04%     
+ Complexity     4321     4320       -1     
============================================
  Files           307      307              
  Lines         18150    18159       +9     
  Branches       1909     1909              
============================================
+ Hits          14415    14430      +15     
+ Misses         2817     2811       -6     
  Partials        918      918              

Flag	Coverage Δ
plugin	79.46% <92.30%> (+0.04%)	⬆️

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Files Changed	Coverage Δ
...va/org/opensearch/ad/AnomalyDetectorJobRunner.java	80.50% <ø> (ø)
.../java/org/opensearch/ad/AnomalyDetectorPlugin.java	96.68% <ø> (ø)
...rg/opensearch/ad/AnomalyDetectorProfileRunner.java	67.95% <ø> (ø)
.../java/org/opensearch/ad/AnomalyDetectorRunner.java	43.52% <ø> (ø)
...in/java/org/opensearch/ad/EntityProfileRunner.java	75.40% <ø> (ø)
...opensearch/ad/ExecuteADResultResponseRecorder.java	75.17% <ø> (ø)
.../main/java/org/opensearch/ad/NodeStateManager.java	74.50% <ø> (ø)
src/main/java/org/opensearch/ad/ProfileUtil.java	94.44% <ø> (ø)
.../java/org/opensearch/ad/caching/PriorityCache.java	68.95% <ø> (ø)
.../opensearch/ad/cluster/ADClusterEventListener.java	86.11% <ø> (ø)
... and 164 more

... and 1 file with indirect coverage changes