Bump version to 10.3.0 for next development cycle

[Copilot]

Now that the 10.2 release branch has been cut, main branch targets 10.3 development. Replicates the pattern from PR #7105 (10.1 → 10.2).

Changes

• eng/Versions.props: MinorVersion 2 → 3

Template snapshot files no longer require updates—they use {VERSION} placeholders managed by the package reference scrubber in the test infrastructure.

Original prompt

Look at the changes made on PR #7105 which bumped the minor version of the assets produced by the repo from 10.1 -> 10.2, and now do the equivalent changes in a PR but now to bump from 10.2 -> 10.3.

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[Copilot]

Pull request overview

This PR bumps the minor version from 10.2 to 10.3 for the next development cycle on the main branch, following the release branch cut for 10.2. This replicates the pattern from previous version bumps (PR #7105 for 10.1→10.2).

Key Changes:

• Update MinorVersion property from 2 to 3 in build configuration