Pin Go toolchain to 1.22.7

[pietern]

Changes

Relates to https://github.com/databricks/cli/pull/1758.

More information about toolchains:

• https://go.dev/blog/toolchain
• https://go.dev/doc/toolchain

We need to specify the toolchain as we need to bump Go to 1.22.0 for the mod upgrade and want to use the latest toolchain on the 1.22 series.

Tests

The previous release was made with Go 1.22.7 so we should continue to use it.

[pietern]

@andrewnester If we merge #1758 without this, we'd end up building with Go 1.22.5 even though the action installs latest.