chore(deps): bump DeterminateSystems/flakehub-cache-action from 2 to 3

Bumps [DeterminateSystems/flakehub-cache-action](https://github.com/determinatesystems/flakehub-cache-action) from 2 to 3.
- [Release notes](https://github.com/determinatesystems/flakehub-cache-action/releases)
- [Commits](DeterminateSystems/flakehub-cache-action@v2...v3)

---
updated-dependencies:
- dependency-name: DeterminateSystems/flakehub-cache-action
  dependency-version: '3'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -43,7 +43,7 @@ jobs:
           extra-conf: lazy-trees = true
 
       - name: Set up FlakeHub Cache
-        uses: DeterminateSystems/flakehub-cache-action@v2
+        uses: DeterminateSystems/flakehub-cache-action@v3
 
       - name: Install Rust (${{ matrix.toolchain.name }})
         uses: actions-rust-lang/setup-rust-toolchain@v1.12.0

.github/workflows/coverage.yml

@@ -24,7 +24,7 @@ jobs:
           extra-conf: lazy-trees = true
 
       - name: Set up FlakeHub Cache
-        uses: DeterminateSystems/flakehub-cache-action@v2
+        uses: DeterminateSystems/flakehub-cache-action@v3
 
       - name: Install Rust
         uses: actions-rust-lang/setup-rust-toolchain@v1.5.0