chore: Minor increase in Pedersen generators for HIGH

[suyash67]

Description

We need 48 generators for hashing in a3 instead of the current 44, for HIGH hash indices (i.e. hash_index ≥ 40).

Checklist:

• I have reviewed my diff in github, line by line.
• Every change is related to the PR description.
• The branch has been merged with/rebased against the head of its merge target.
• There are no unexpected formatting changes, superfluous debug logs, or commented-out code.
• There are no circuit changes, OR a cryptographer has been assigned for review.
• New functions, classes, etc. have been documented according to the doxygen comment format. Classes and structs must have @brief describing the intended functionality.
• If existing code has been modified, such documentation has been added or updated.
• No superfluous include directives have been added.
• I have linked to any issue(s) it resolves.
• I'm happy for the PR to be merged at the reviewer's next convenience.

[ludamad]

Good with me pending no impact on Noir

[suyash67]

noir-ci is breaking on increasing the total Pedersen generators even slightly (from 776 to 792). This was the case even we reduced the total number of generators from ~2000 to 776 (PR #413). So I am merging this one to unblock pending nullifier work on packages.