Bump lxml from 4.5.0 to 4.9.1

Bumps [lxml](https://github.com/lxml/lxml) from 4.5.0 to 4.9.1.
- [Release notes](https://github.com/lxml/lxml/releases)
- [Changelog](https://github.com/lxml/lxml/blob/master/CHANGES.txt)
- [Commits](lxml/lxml@lxml-4.5.0...lxml-4.9.1)

---
updated-dependencies:
- dependency-name: lxml
  dependency-type: direct:production
...

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

requirements.txt

@@ -4,25 +4,52 @@
 #
 #    pip-compile --output-file requirements.txt requirements.in
 #
-attrs==19.3.0             # via unified-range
-boto3==1.9.44
+attrs==19.3.0
+    # via unified-range
 boto==2.49.0
+    # via -r requirements.in
+boto3==1.9.44
+    # via -r requirements.in
 botocore==1.12.44
-certifi==2020.4.5.1       # via requests
-chardet==3.0.4            # via requests
-docutils==0.16            # via botocore
-idna==2.9                 # via requests
-jmespath==0.9.5           # via boto3, botocore
+    # via
+    #   -r requirements.in
+    #   boto3
+    #   s3transfer
+certifi==2020.4.5.1
+    # via requests
+chardet==3.0.4
+    # via requests
+docutils==0.16
+    # via botocore
+idna==2.9
+    # via requests
+jmespath==0.9.5
+    # via
+    #   boto3
+    #   botocore
 json5==0.6.1
-lxml==4.5.0
+    # via -r requirements.in
+lxml==4.9.1
+    # via -r requirements.in
 pyjwt==1.4.0
-python-dateutil==2.8.1    # via botocore
-requests-futures==0.9.7
+    # via -r requirements.in
+python-dateutil==2.8.1
+    # via botocore
 requests==2.23.0
-s3transfer==0.1.13        # via boto3
+    # via
+    #   -r requirements.in
+    #   requests-futures
+requests-futures==0.9.7
+    # via -r requirements.in
+s3transfer==0.1.13
+    # via boto3
 semantic-version==2.8.4
-six==1.14.0               # via python-dateutil
+    # via -r requirements.in
+six==1.14.0
+    # via python-dateutil
 unified-range==0.0.9
-urllib3==1.24.3           # via botocore, requests
-git+https://[email protected]/fabric8-analytics/victimsdb-lib.git@3e2e72b#egg=victimsdb-lib
-git+https://[email protected]/fabric8-analytics/fabric8-analytics-utils.git@dc7f0f9#egg=f8a-utils
+    # via -r requirements.in
+urllib3==1.24.3
+    # via
+    #   botocore
+    #   requests