[Backport 2.x] Bump BouncyCastle from jdk15on to jdk15to18 (#2901)

[willyborankin]

Backport 9a72355 from #2901

[codecov]

Codecov Report

Merging #2917 (668b6f1) into 2.x (101f58c) will decrease coverage by 0.08%.
The diff coverage is 52.94%.

@@             Coverage Diff              @@
##                2.x    #2917      +/-   ##
============================================
- Coverage     62.13%   62.05%   -0.08%     
+ Complexity     3374     3368       -6     
============================================
  Files           264      264              
  Lines         19441    19440       -1     
  Branches       3315     3314       -1     
============================================
- Hits          12080    12064      -16     
- Misses         5767     5776       +9     
- Partials       1594     1600       +6     

Impacted Files	Coverage Δ
...ensearch/security/ssl/DefaultSecurityKeyStore.java	67.26% <52.94%> (-0.27%)	⬇️

... and 6 files with indirect coverage changes

[RyanL1997]

Hey @willyborankin, thank you for taking care of the backport. The style check is failing due to this error:

Error: eckstyle] [ERROR] /home/runner/work/security/security/src/main/java/org/opensearch/security/ssl/DefaultSecurityKeyStore.java:20:8: Unused import - java.io.ByteArrayInputStream. [UnusedImports]

[willyborankin]

Hey @willyborankin, thank you for taking care of the backport. The style check is failing due to this error:

Error: eckstyle] [ERROR] /home/runner/work/security/security/src/main/java/org/opensearch/security/ssl/DefaultSecurityKeyStore.java:20:8: Unused import - java.io.ByteArrayInputStream. [UnusedImports]

Oops will fix

[willyborankin]

Hey @willyborankin, thank you for taking care of the backport. The style check is failing due to this error:

Error: eckstyle] [ERROR] /home/runner/work/security/security/src/main/java/org/opensearch/security/ssl/DefaultSecurityKeyStore.java:20:8: Unused import - java.io.ByteArrayInputStream. [UnusedImports]

Oops will fix

fixed