chore: pin canton-lib deps to v0.6.0 tag

Replaces the temporary branch refs (`branch =
"chore/bump-canton-api-client-3.6.0"`) on `ledger`/`keycloak`/`registry`/
`common` with `tag = "v0.6.0"`. canton-lib v0.6.0 (DLC-link/canton-lib#20)
contains the 3.6.0 bump (#18) plus the keycloak Quarkus token-URL helpers
(#19); the upstream PR branch was deleted on merge, so the previous refs no
longer resolve.

Cargo.lock updated by `cargo update -p ledger -p keycloak -p registry -p
common`. `cargo check` clean.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: gyorgybalazsi

Cargo.lock

@@ -8,10 +8,10 @@ autoexamples = false
 uninlined_format_args = "allow"
 
 [dependencies]
-ledger = { git = "ssh://git@github.com/DLC-link/canton-lib", branch = "chore/bump-canton-api-client-3.6.0" }
-keycloak = { git = "ssh://git@github.com/DLC-link/canton-lib", branch = "chore/bump-canton-api-client-3.6.0" }
-registry = { git = "ssh://git@github.com/DLC-link/canton-lib", branch = "chore/bump-canton-api-client-3.6.0" }
-common = { git = "ssh://git@github.com/DLC-link/canton-lib", branch = "chore/bump-canton-api-client-3.6.0" }
+ledger = { git = "ssh://git@github.com/DLC-link/canton-lib", tag = "v0.6.0" }
+keycloak = { git = "ssh://git@github.com/DLC-link/canton-lib", tag = "v0.6.0" }
+registry = { git = "ssh://git@github.com/DLC-link/canton-lib", tag = "v0.6.0" }
+common = { git = "ssh://git@github.com/DLC-link/canton-lib", tag = "v0.6.0" }
 tokio = { version = "1.48.0", features = ["macros", "rt-multi-thread"] }
 serde_json = "1"
 chrono = "0.4.42"