fix security scan (rebalancer): remove python3 libraries

[boddumanohar]

security scan for rebalancer image is failing with this:

urllib3   1.26.19    2.6.3     python  GHSA-38jv-5279-wg99  High      2.7% (83rd)  2.1    
urllib3   1.26.19    2.6.0     python  GHSA-2xpw-w6gg-jr37  High      0.6% (46th)  0.5    
urllib3   1.26.19    2.6.0     python  GHSA-gm62-xv2j-4w53  High      0.6% (46th)  0.5    
urllib3   1.26.19    2.7.0     python  GHSA-qccp-gfcp-xxvc  High      0.5% (40th)  0.4    
idna      3.7        3.15      python  GHSA-65pc-fj4g-8rjx  Medium    0.4% (32nd)  0.2    
urllib3   1.26.19    2.5.0     python  GHSA-pq67-6m6q-mj2v  Medium    0.4% (32nd)  0.2    
requests  2.32.4     2.33.0    python  GHSA-gc5v-m9x4-r6x2  Medium    0.2% (7th)   < 0.1 

rebalancer is a golang binary. So it doesn't require these python packages.

tested this and have successful scan here:
https://github.com/simplyblock/simplyblock-operator/actions/runs/29334599877/job/87090590818

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additionally have updated the slack message to show the component name