build(deps): bump esp-rs/xtensa-toolchain in the github-actions group (#8864)

Bumps the github-actions group with 1 update: [esp-rs/xtensa-toolchain](https://github.com/esp-rs/xtensa-toolchain).


Updates `esp-rs/xtensa-toolchain` from 1.5 to 1.6
- [Release notes](https://github.com/esp-rs/xtensa-toolchain/releases)
- [Commits](https://github.com/esp-rs/xtensa-toolchain/compare/v1.5...v1.6)

---
updated-dependencies:
- dependency-name: esp-rs/xtensa-toolchain
  dependency-version: '1.6'
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/ci.yaml

@@ -439,7 +439,7 @@ jobs:
 #        steps:
 #            - uses: actions/checkout@v4
 #            - uses: dtolnay/rust-toolchain@stable
-#            - uses: esp-rs/xtensa-toolchain@v1.5
+#            - uses: esp-rs/xtensa-toolchain@v1.6
 #              with:
 #                  default: true
 #                  buildtargets: esp32
@@ -608,7 +608,7 @@ jobs:
         steps:
             - uses: actions/checkout@v4
             - uses: dtolnay/rust-toolchain@stable
-            - uses: esp-rs/xtensa-toolchain@v1.5
+            - uses: esp-rs/xtensa-toolchain@v1.6
               with:
                   default: true
                   buildtargets: esp32

.github/workflows/nightly_tests.yaml

@@ -20,7 +20,7 @@ jobs:
         steps:
             - uses: actions/checkout@v4
             - uses: dtolnay/rust-toolchain@stable
-            - uses: esp-rs/xtensa-toolchain@v1.5
+            - uses: esp-rs/xtensa-toolchain@v1.6
               with:
                   default: true
                   buildtargets: esp32