update minimum go version to go1.24

Various dependencies, including "golang.org/x/.."  started to update
the minimum required version,so we should follow suit for the next
release.

Note that the `//go:build` directives not necesserily have to be
updated, but it's good to keep them in sync until we have a go.mod
to control this.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cli/command/plugin/formatter_test.go

@@ -1,5 +1,5 @@
 // FIXME(thaJeztah): remove once we are a module; the go:build directive prevents go from downgrading language version to go1.16:
-//go:build go1.23
+//go:build go1.24
 
 package plugin
 

cli/command/plugin/inspect.go

@@ -1,5 +1,5 @@
 // FIXME(thaJeztah): remove once we are a module; the go:build directive prevents go from downgrading language version to go1.16:
-//go:build go1.23
+//go:build go1.24
 
 package plugin