apacheGH-44253: [CI][Release][Python] Do not verify Python on Ubuntu …

…20.04 (apache#44254)

### Rationale for this change
Python 3.8 is no longer supported for Pyarrow. Ubuntu 20.04 ships with Python 3.8

### What changes are included in this PR?

Remove verification checks on Ubuntu 20.04

### Are these changes tested?

Via archery

### Are there any user-facing changes?

No
* GitHub Issue: apache#44253

Authored-by: Raúl Cumplido <[email protected]>
Signed-off-by: Sutou Kouhei <[email protected]>

dev/tasks/tasks.yml

@@ -922,6 +922,9 @@ tasks:
                     "js",
                     "python",
                     "ruby"] %}
+    # Skip verification for python and integration on Ubuntu 20.04
+    # GH-44253. Remove once we drop support for 20.04
+    {% if not (target in ["python", "integration"] and version == "20.04") %}
   verify-rc-source-{{ target }}-linux-{{ distribution }}-{{ version }}-amd64:
     ci: github
     template: verify-rc/github.linux.amd64.docker.yml
@@ -930,15 +933,20 @@ tasks:
         {{ distribution.upper() }}: "{{ version }}"
       target: {{ target }}
       distro: {{ distribution }}
+    {% endif %}
   {% endfor %}
 
   {% for target in ["jars", "wheels"] %}
+    # Skip verification for wheels on Ubuntu 20.04
+    # GH-44253. Remove once we drop support for 20.04
+    {% if not (target == "wheels" and version == "20.04") %}
   verify-rc-binaries-{{ target }}-linux-{{ distribution }}-{{ version }}-amd64:
     ci: github
     template: verify-rc/github.linux.amd64.docker.yml
     params:
       target: {{ target }}
       distro: {{ distribution }}
+    {% endif %}
   {% endfor %}
 
 {% endfor %}