chore(deps): bump mamba-org/setup-micromamba from 1 to 2

Bumps [mamba-org/setup-micromamba](https://github.com/mamba-org/setup-micromamba) from 1 to 2.
- [Release notes](https://github.com/mamba-org/setup-micromamba/releases)
- [Commits](mamba-org/setup-micromamba@v1...v2)

---
updated-dependencies:
- dependency-name: mamba-org/setup-micromamba
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/release.yml

@@ -118,7 +118,7 @@ jobs:
         run: pixi run install
 
       - name: Setup Micromamba
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: modflow6/environment.yml
           cache-downloads: true
@@ -380,7 +380,7 @@ jobs:
         run: sudo ./install.sh --all-users
 
       - name: Setup Micromamba
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: modflow6/environment.yml
           cache-downloads: true
@@ -523,7 +523,7 @@ jobs:
           path: modflow6-examples
 
       - name: Setup Micromamba
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: modflow6/environment.yml
           cache-downloads: true

.github/workflows/release_dispatch.yml

@@ -185,7 +185,7 @@ jobs:
           ref: ${{ github.ref }}
 
       - name: Setup Micromamba
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: environment.yml
           cache-downloads: true
@@ -245,7 +245,7 @@ jobs:
           path: modflow6
 
       - name: Setup Micromamba
-        uses: mamba-org/setup-micromamba@v1
+        uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: modflow6/environment.yml
           cache-downloads: true