Update Go version for building to 1.21

Changelog for 0.3.2-rc2:

• PR #43 Fix leader-election-role rules by @nsurleraux-railnova

Commits
3b93fb6 Update Go version for builds by @alexellis
66549f8 manifest generated by @nsurleraux-railnova
be30987 Fix leader-election-role rules by @nsurleraux-railnova
0bd7cb1 Update controller version by @alexellis

Changes: 0.3.2-rc1...0.3.2-rc2

Generated by Derek