chore: change shebang in link_all.sh to be portable

[gshpychka]

Reason for this change

Current shebang in link_all.sh is !#/bin/bash, which does not work if the bash binary is not present in /bin (such is the case on e.g. NixOS).

Description of changes

Change the sheband to !#/usr/bin/env bash, so that bash is executed from wherever it's present, not necessarily /bin/bash.

Description of how you validated changes

The current script fails on NixOS for me.
The script with the updated shebang suceeds.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.21%. Comparing base (07f0fe3) to head (c1609f5).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33520   +/-   ##
=======================================
  Coverage   82.21%   82.21%           
=======================================
  Files         119      119           
  Lines        6876     6876           
  Branches     1162     1162           
=======================================
  Hits         5653     5653           
  Misses       1120     1120           
  Partials      103      103           

Flag	Coverage Δ
suite.unit	82.21% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	∅ <ø> (∅)
packages/aws-cdk-lib/core	82.21% <ø> (ø)

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Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: c1609f5
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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