Temporarily avoid broken libpq conda package (#863)

Avoids the following error that results when the [latest
libpq](https://anaconda.org/conda-forge/libpq) (17.0) is installed from
conda-forge:

```
Error: pg_config --includedir is empty
```

conda-envs/mlos-3.10.yml

@@ -20,7 +20,8 @@ dependencies:
   - pandas
   - pyarrow
   - swig
-  - libpq
+  # FIXME: Temporarily avoid broken libpq that's missing client headers.
+  - libpq<17.0
   - python=3.10
   # See comments in mlos.yml.
   #- gcc_linux-64

conda-envs/mlos-3.11.yml

@@ -20,7 +20,8 @@ dependencies:
   - pandas
   - pyarrow
   - swig
-  - libpq
+  # FIXME: Temporarily avoid broken libpq that's missing client headers.
+  - libpq<17.0
   - python=3.11
   # See comments in mlos.yml.
   #- gcc_linux-64

conda-envs/mlos-3.12.yml

@@ -22,7 +22,8 @@ dependencies:
   - pandas
   - pyarrow
   - swig
-  - libpq
+  # FIXME: Temporarily avoid broken libpq that's missing client headers.
+  - libpq<17.0
   - python=3.12
   # See comments in mlos.yml.
   #- gcc_linux-64

conda-envs/mlos-3.8.yml

@@ -20,7 +20,8 @@ dependencies:
   - pandas
   - pyarrow
   - swig
-  - libpq
+  # FIXME: Temporarily avoid broken libpq that's missing client headers.
+  - libpq<17.0
   - python=3.8
   # See comments in mlos.yml.
   #- gcc_linux-64

conda-envs/mlos-3.9.yml

@@ -20,7 +20,8 @@ dependencies:
   - pandas
   - pyarrow
   - swig
-  - libpq
+  # FIXME: Temporarily avoid broken libpq that's missing client headers.
+  - libpq<17.0
   - python=3.9
   # See comments in mlos.yml.
   #- gcc_linux-64

conda-envs/mlos-windows.yml

@@ -21,7 +21,8 @@ dependencies:
   - pandas
   - pyarrow
   - swig
-  - libpq
+  # FIXME: Temporarily avoid broken libpq that's missing client headers.
+  - libpq<17.0
   - python
   # Install an SMAC requirement pre-compiled from conda-forge.
   # This also requires a more recent vs2015_runtime from conda-forge.

conda-envs/mlos.yml

@@ -20,7 +20,8 @@ dependencies:
   - pandas
   - pyarrow
   - swig
-  - libpq
+  # FIXME: Temporarily avoid broken libpq that's missing client headers.
+  - libpq<17.0
   - python
   - pip:
     - bump2version