Update .NET 10 SDK images with PowerShell v7.6.4

[jshigetomi]

This pull request updates the PowerShell global tool version from 7.6.2 to 7.6.4 across all .NET SDK 10.0 Dockerfiles and updates the associated SHA512 checksums and metadata to match the new version. This ensures that the Docker images use the latest stable PowerShell release and maintain integrity checks.

PowerShell Version Update:

• All relevant Dockerfiles in src/sdk/10.0/ now install PowerShell version 7.6.4 instead of 7.6.2. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16]

Checksum and Metadata Updates:

• Updated all corresponding SHA512 checksums for the new PowerShell 7.6.4 nupkg files in the Dockerfiles to ensure package integrity. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16]
• Updated manifest.versions.json to reflect the new PowerShell 10.0 build version and all related SHA values.

No other functional changes were made; this is a routine dependency and integrity update to keep the images secure and up to date.