chore(deps): update nearprotocol/nearcore docker tag to v2.6.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
nearprotocol/nearcore	stage	patch	2.6.0 -> 2.6.1

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[github-actions]

🔍 Trivy Dockerfile Scan Results for clients/exec/neard/Dockerfile

Click to view findings

Report Summary

┌────────────┬────────────┬───────────────────┐
│   Target   │    Type    │ Misconfigurations │
├────────────┼────────────┼───────────────────┤
│ Dockerfile │ dockerfile │         2         │
└────────────┴────────────┴───────────────────┘
Legend:
- '-': Not scanned
- '0': Clean (no security findings detected)


Dockerfile (dockerfile)
=======================
Tests: 21 (SUCCESSES: 19, FAILURES: 2)
Failures: 2 (HIGH: 2, CRITICAL: 0)

AVD-DS-0002 (HIGH): Specify at least 1 USER command in Dockerfile with non-root user as argument
════════════════════════════════════════
Running containers with 'root' user can lead to a container escape situation. It is a best practice to run containers as non-root users, which can be done by adding a 'USER' statement to the Dockerfile.

See https://avd.aquasec.com/misconfig/ds002
────────────────────────────────────────


AVD-DS-0029 (HIGH): '--no-install-recommends' flag is missed: 'apt-get update &&     apt-get install sysstat -y &&     apt-get clean &&     rm -rf /var/lib/apt/lists/* /usr/share/doc/* /var/cache/ldconfig/aux-cache /usr/lib/python3.9/__pycache__/ /usr/lib/python3.9/*/__pycache__/ /var/log/*'
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'apt-get' install should use '--no-install-recommends' to minimize image size.

See https://avd.aquasec.com/misconfig/ds029
────────────────────────────────────────
 Dockerfile:9-12
────────────────────────────────────────
   9 ┌ RUN apt-get update && \
  10 │     apt-get install sysstat -y && \
  11 │     apt-get clean && \
  12 └     rm -rf /var/lib/apt/lists/* /usr/share/doc/* /var/cache/ldconfig/aux-cache /usr/lib/python3.9/__pycache__/ /usr/lib/python3.9/*/__pycache__/ /var/log/*
────────────────────────────────────────

Please review these findings and make necessary fixes to improve the security of your Dockerfile.