Fix Ceph tests failing due to dependency issues

[Kerkesni]

• Upgrade Ruby from 2.5.9 to 3.2 in ceph-backend-test job
• Update gem versions for Ruby 3.2 compatibility:
  • nokogiri: 1.12.5 → 1.15.5
  • excon: 0.109.0 → 0.111.0
  • fog-aws: 1.3.0 → 3.19.0
  • mime-types: 3.1 → 3.5.2
  • rspec: 3.5 → 3.12.0
• Fixes "Proc object without a block" and numbered parameter syntax errors
• Resolves multi_json dependency conflicts with modern Ruby versions

Issue: CLDSRV-715

[bert-e]

Hello kerkesni,

My role is to assist you with the merge of this
pull request. Please type @bert-e help to get information
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Status report is not available.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.08%. Comparing base (261cb34) to head (b6a78b9).
Report is 1 commits behind head on development/8.8.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@               Coverage Diff                @@
##           development/8.8    #5858   +/-   ##
================================================
  Coverage            65.08%   65.08%           
================================================
  Files                  188      188           
  Lines                11948    11948           
================================================
  Hits                  7776     7776           
  Misses                4172     4172           

Flag	Coverage Δ
unit	65.08% <ø> (ø)

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[bert-e]

Request integration branches

Waiting for integration branch creation to be requested by the user.

To request integration branches, please comment on this pull request with the following command:

/create_integration_branches

Alternatively, the /approve and /create_pull_requests commands will automatically
create the integration branches.

[Kerkesni]

/create_integration_branches

[bert-e]

Integration data created

I have created the integration data for the additional destination branches.

• this pull request will merge improvement/CLDSRV-715 into
  development/8.8
• w/9.0/improvement/CLDSRV-715 will be merged into development/9.0
• w/9.1/improvement/CLDSRV-715 will be merged into development/9.1

The following branches will NOT be impacted:

• development/7.10
• development/7.4
• development/7.70

You can set option create_pull_requests if you need me to create
integration pull requests in addition to integration branches, with:

@bert-e create_pull_requests

The following options are set: create_integration_branches

[bert-e]

Waiting for approval

The following approvals are needed before I can proceed with the merge:

• the author

• 2 peers

The following options are set: create_integration_branches

[Kerkesni]

/approve

[bert-e]

I have successfully merged the changeset of this pull request
into targetted development branches:

• ✔️ development/8.8

• ✔️ development/9.0

• ✔️ development/9.1

The following branches have NOT changed:

• development/7.10
• development/7.4
• development/7.70

Please check the status of the associated issue CLDSRV-715.

Goodbye kerkesni.

The following options are set: approve, create_integration_branches