Upgrade to Spring Data Neumann-M2

[wilkinsona]

This will also require #18621.

[wilkinsona]

Let's keep this open until we've moved off snapshots.

[snicoll]

🤦‍♀️

[philwebb]

The upgrade causes issue because the M1 BOM is incorrect. We're waiting to see what the Data team want to do.

[philwebb]

See DATACMNS-1654

[scottfrederick]

The spring-data-relational dependency version can be forced with a change like this in spring-boot-dependencies:

	library('Spring Data Releasetrain', 'Neumann-M1') {
		group('org.springframework.data') {
			imports = [
				'spring-data-releasetrain'
			]
		}
	}
	library('Spring Data Relational', '2.0.0.M1') {
		group('org.springframework.data') {
			imports = [
				'spring-data-relational'
			]
		}
	}

[snicoll]

The Spring Data team decided to ship M2 with a fix to that bom.