Fix "align" repr support in declare_program!

[0xBurbo]

Problem: During declare_program Current code generates token stream that writes account representation alignment including the integer suffix: "#[align(8usize)]". This breaks compilation, and should look like "#[align(8)]"

This commit uses a proc_macro2 literal without the integer suffix to resolve the issue.

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[0xBurbo]

Changelog has been updated