fix(PCL for Osmosis): address issues found by Oak audit (#5)

* fix double refund on excess offer assets

* ensure token_in_denom belongs to pair in swap_exact_amount_out

* don't update price on small trade sizes in swap_exact_amount_out

* pass msg.whitelist_code_id to config on factory instantiation

* factory: emit events on update config fields

* general refactoring

* add before_swap_check validation in reverse swap and swap_exact_amount_out

* bump Rust version used in CI

* bump Rust version used in CI

.github/workflows/check_artifacts.yml

@@ -49,7 +49,7 @@ jobs:
         uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: 1.68.0
+          toolchain: 1.75.0
           override: true
 
       - name: Fetch cargo deps

.github/workflows/code_coverage.yml

@@ -39,7 +39,7 @@ jobs:
         uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: 1.68.0
+          toolchain: 1.75.0
           override: true
 
       - name: Run cargo-tarpaulin

.github/workflows/tests_and_checks.yml

@@ -50,7 +50,7 @@ jobs:
         uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: 1.68.0
+          toolchain: 1.75.0
           override: true
           target: wasm32-unknown-unknown
           components: rustfmt, clippy, llvm-tools-preview