Enable bodyclose linter (#36168)

Enabe
[`bodyclose`](https://golangci-lint.run/docs/linters/configuration/#bodyclose).
The only issue in non-test code (`services/migrations/dump.go`) was a
false-positive and I think there are a number of undetected cases, but I
guess it's still better than not having it.

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

tests/integration/api_activitypub_person_test.go

@@ -78,6 +78,7 @@ func TestActivityPubPerson(t *testing.T) {
 
 		// Signed request succeeds
 		resp, err := c.Post([]byte{}, user2inboxurl)
+		defer resp.Body.Close()
 		assert.NoError(t, err)
 		assert.Equal(t, http.StatusNoContent, resp.StatusCode)
 

tests/integration/api_packages_generic_test.go

@@ -163,6 +163,7 @@ func TestPackageGeneric(t *testing.T) {
 
 			resp2, err := (&http.Client{}).Get(location)
 			assert.NoError(t, err)
+			defer resp2.Body.Close()
 			assert.Equal(t, http.StatusOK, resp2.StatusCode, location)
 
 			body, err := io.ReadAll(resp2.Body)