chore: add check for jq to update.sh script

[MikeMcC399]

Description

Add a check to the update.sh script for the availability of the jq command.

Output instructions to install jq from https://jqlang.org/download/ if not found.

Motivation and Context

PR #2598 added some additional usage of jq in the update.sh script.

If an attempt is made to run ./update.sh without jq installed, the error messages are quite noisy and untidy.

Testing Details

On Ubuntu 24.04.4 LTS

git clone https://github.com/nodejs/docker-node
cd docker-node

sudo apt-get -y remove jq # if previously installed
./update.sh -h # confirm help is displayed
./update.sh 26 # confirm jq message displayed

sudo apt-get install jq
./update.sh -h # confirm help is displayed
./update.sh 26 # confirm update is run

Test logs

New output is:

**jq not installed**
Follow the instructions in https://jqlang.org/download/ to install

Other output, as previously.

Types of changes

• Documentation
• Version change (Update, remove or add more Node.js versions)
• Variant change (Update, remove or add more variants, or versions of variants)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Other (none of the above)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING.md document.
• All new and existing tests passed.

[MattIPv4]

jq was already used in the script prior to that change, so I'm surprised this hasn't been an issue before!

[MikeMcC399]

@MattIPv4

I also corrected the text in this PR.